The Happy Mask Shopkeeper is one weird dude. It's probably the most interesting shop in the game, and we all know that this guy has a big part to play in Majora's Mask (which I'm hoping Nintendo are going to remake next). But if you're doing the mask quest as Young Link, then you'll get to a point where you don't know what to do with the Bunny Hood.

The first few masks in the trading sequence are pretty easy to find owners for:
- Keaton Mask - Castle Guard outside the gates to Death Mountain in Kakariko Village
- Skull Kid Mask - Skull Kid that you play Saria's Song to in The Lost Woods
- Spooky Mask - Kid who pretends to be Dampé in Kakariko Graveyard
But then you get the Bunny Hood, a hood that mimics the look of the rabbits that used to roam Hyrule in the past. People in Hyrule Castle Town usually give you information about the masks to make it easy to find their owners, but when you get the Bunny Hood, they all seem a little vague. That's before you complete the third dungeon, Inside Jabu-Jabu's Belly, at any rate.

As soon as you complete that level, you'll see a man running around Hyrule Field. He's running pretty fast, but he's about to become a whole lot faster.
Use the new sprint button (hold down the roll button) to catch up with him while wearing the Bunny Hood. He'll stop and get excited about the prospect of seeing the hood. Chat to him, and he'll give you a whopping 200 Rupees for it, giving you a 150 Rupee profit!

He'll run off and bash you into the dirt, allowing you to go back to the Happy Mask Shop and borrow the Mask of Truth! This is such a great feature, as it adds a much darker tone to previously happy-looking people that you meet in the world, letting you see their truth. I won't spoil this for you anymore; just go and talk to everyone while wearing the mask!