This strange glitch is rather complicated but it's worth the trouble.

First, go to Lake Hylia and play the Fruit Popping minigame. When the game starts, ram your head into the wall.

Once you respawn and the bird says that that was lame and asks you to try again, say no, and turn back into a human. Bring out whatever kind of clawshot you have, and L-target forwards. Strafe against the wall, pushing in on where the wall sticks in/out a lot, and if you do it right, you should go right through the wall!

But that's not all, if you swim out a bit you will fall off the edge of naothing... once you respawn, that bird should appear and tell you that was lame and ask if you want to try again (WTH XD). Say yes, and once again, ram headfirst against the wall.

When you respawn, you should be standing outside of the canoe minigame map. Turn into a wolf, back up as much as possible, (Don't fall off!) and dash forward and land in the river.

Now here's the wierd part, a cutscene should start, showing you, or what used to be you, in a wierd morphed posture with what looks like Midna's head sticking out of your neck. The view is blocked by giant pyramids flying out of your body. When the Zora asks you if you want to try again, SAY YES OR YOU WILL HAVE TO RESET THE GAME. Now you will be trapped in a house, unable to transform back into a human. Warp out (You can) of the house to end the glitch.

PS: I tried this on the GCN version. No clue if it works on Wii. I got 2 more glitches to show you later, so look at my profile often!