It really grinds my gears when people talk during movies,. That right there gets me fired up! I'm just trying to enjoy the movie i payed to go see and there is always that one person who wants to tell his life story throughout the entire movie. And that's what grinds my gears. 

Family guy parody! 

You know what really grinds my gears? When you say hi to someone and they don't hear it. So you yell it but then you get yelled at for it! I mean, REALLY? 

Hmm. What "grinds my gears"?

I suppose people who think "They're all that in a bag of chips", I mean, really?
You one out of millions of people. You're not the greatest thing to happen in this world. 
Until you save the world, resolve a worldwide/political problem. You're just another human being.

Or having one save file on a video game. Come on! D:

What "grinds my gears" the most is..

Pokemon not being an MMORPG. COME ONE D:<
Legendaries could be dungeon monsters we could farm on!
It's a perfect game. 

Though, I'm pretty passive on things =p 
Things don't normally "grind my gears" too much.

Edit:

@SamB: I feel it. I can't stand watching a movie with people that talk. My roommates do it all the time. Especially with horror films. " damn. I told y'all shouldn't go in there." or " WHY ARE YOU GOING TO THE POLICE?!? THEY'RE DYING"

Honestly, I think going to the police is perfect for nearly every horror film. It's realistic and I believe it would be the right thing to do. Report to the authorities. 

Or watching a military film with someone in the military. That's just so much fun -.-

Nothing really irritates me that much to be honest. I will say that people who like to pick on others just to get a kick out of it annoys me. Especially when I feel that the victim can't handle it. I also don't like the fact that Americans call football soccer

People chewing loudly with their mouth open irritates me quite a bit. 

What grinds my gears is when people blame bush for the financial hole. Bush spent a lot on a shovel. To bash the Taliban in the head. Obama took the shovel, bought a cloning machine. Took one of his supporters. Cloned him and a shovel. And got them to dig the financial hole.
                   

                       ______
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 D==========------------ )
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(REALLY big shovel used to dig the financial hole. And its wind, solar, and nucular( XD ) powered.)

- Having to wake up early or suddenly when my body is telling me I need more sleep.
- People who exhibit no compassion or empathy.
- People walking extremely slowly in a crowd of people who are all trying to get somewhere.
- People who attempt to talk about things they obviously don't actually know about or understand.
- My inability to stop biting my nails.
- People who try to tell me I should give up on what matters to me, or do the opposite/something different than my goals and what I want.
- Men who disrespect me, make rude or sexual comments to me, or hit on me, when I clearly express my dislike for this and explain I'm not interested. (Protip: This gets you blocked.)

- Having to wake up when I want to sleep more                                                                                                                                                                                                                                                                                                                                                                                                                                             - people being mean to me while I'm helping them                                                                                                                                                                       -people hitting me for no resend                                                                                                                                                                                                        - there will be no more mega man battle network                                                                                                                                                                    - people telling me to give up                                                                                                                                                                                                                - people can not be trusted anymore or they will steal                                                                                                                                                                 - the police being lazy and get paid to do nothing                                                                                                                                                                         - the economics being bad and there is more taxes                                                                                                                                                                        - and funnily coke is getting out of the shells forever 

When someone forgets your name or birthday but what i really hate is someone who being a jerk when iam playing vidoe games peace

You know what grinds my gears: Level Up from cartoon network, anyone who will diss video games, the fact that Ash Ketchum can never win a Pokémon league besides the Orange Islands, Homework, the FCAT, corrupt politiitions, 4kids, how hard Whitney is in G/S/C/HG/SS and that she doesn't give you a badge for beating her, the newer Spongebobs and Cilan replacing Brock in  the anime

having to wait on somthig

What grinds my gears is someone who want to have a conversation with you on the phone and they keep giving one word responses, and turning on my light in the morning trying to wake me up.

What  Grinds my Gears?
Religious Debates.
Arguments again basic civil rights.
Racism
 Bullies
 Politics
When people rub their hands  on a surface and make that squeaking sound.
People who hate Justin Bieber for no legitimate reason
People who carelessly throw away their lives.

The thing that grinds my gears the most are people who think, say or assume they are right even when you give them substantial amount of evidence proving they are wrong. They keep trying to defend themselves saying they found there proof on the internet saying,"The internet is always right." *facepalm*

Oh, only to name a few.

When people act smart but aren't.

When people think psychology and psychiatry are the same thing.

People who call red heads gingers... grrrrrrrrr.

people who stick to an uneducated opinion

people who try to get me to convert to their beliefs, if it happened to you as often as it does to me, you would know what I meant.

There, just to name a few.

People bashing the President. Hey, I'm not a fan, but not everything is his fault. No president is liked. lol we blamed the last one for everything, and we'll blame the next one too.
People who know everything (especially when they're wrong most of the time)
People bashing their country. Nobody is making you spend your life here.
And most of all: people bashing our armed forces. What is that?? Oh yeah, they risk it all for your country, and all you can do is hate them for it? You think they enjoy doing that stuff?
I'll shut up now.

Call Of Duty players, Wiggas (white people who think they're black), l33t language, internet memes, facebook, PSN (Playstation Network), Jimmy Savile, David Cameron, Nick Clegg, Dead Space 3, the last Batman film with Bane, overated things and My friend Kyle who sings cheesey rap song about video games and when I tell him to shut up he flips me off and says I like Call Of Duty when I clearly don't.