There's an area in Lost Woods known as the Forest Stage. To find it, go to the Lost Woods and follow these directions:

Right
Left
Right
Left
Left

In the resulting area, there will be a large patch of brush along with two of the business Deku Scrubs. Ignore them and go to the brush. There are butterflies flying around a certain area. Run around in that area and you'll eventually fall down one of those black holes that are all over the place. The brush makes it impossible to tell the hole's exact location.



Once you fall, step forward a few paces. A bunch of Deku Scrubs will appear out of the ground. Here's some well phrased info from Zeldapedia:

The Keaton Mask, Spooky Mask, Bunny Hood, Zora Mask, Goron Mask and Gerudo Mask produce one of two random results: the Deku Scrubs will either shower Link with Rupees, or continuously attack him until he leaves the area or gets a Game Over. In earlier versions of the game, there is a set pattern that will produce the Rupee result and what will produce the attacking result. In newer versions, it is thought to be random.

If you wear the Skull Mask, they will flock around you until you approach their leader. He is still underground over on the ledge to the right. He will pop up and grant you the ability to carry up to 30 Deku Sticks.

If you wear the Mask of Truth you will get a similar reaction ending with an increase in Deku Nut capacity. More important Zeldapedia info:

In earlier versions of the game, this can be completed only before Link has pulled the Master Sword from the Pedestal of Time for the first time. Any subsequent times will not result in a Deku Nut upgrade but rather cause the Deku Scrubs to attack Link.

That means that after you finish Jabu Jabu, you have to go sell the Bunny Hood, then go get the Mask of Truth before you grab the Master Sword. I just thought I'd share this info with people who can still go and do it.

Holy crap, in all my years of playing that game, I never knew that was possible lol.

I'll go try it now.