The flying Zora Link glitch in MM. Because the Zora evolved into Rito, and the Rito are postmen, who deal with letters. But you wouldn't expect to see a Zora fly.
And the easiest place to do this is in the Great Bay, where you repeatedly swim into something to make him hover out of the water... this can also be done against walls in other places, and I think it enables you to swim through walls in some places too.
EDIT: Also, on the off-chance I am right, my turn's up for grabs because I probably won't be able to answer ^~^