Oh man, has anyone tried this 'black hole' bug? It requires four players. My friends and I love doing it. Basically you take either two Foxes/Falcos or both and put them on the two ledges on the right side of Hyrule Temple. They both have to hold down their reflector shields. Then, you take Ness (and make sure you have the item Super Scope available), and somehow he can make it so that the Super Scope has infinite fire (I don't know how exactly it works). Then he fires from near Falco/Fox to hit the other Falco/Fox on the other ledge. The bullets should reflect from both of them infinitely. Wait until the entire line of fire turns green (you'll notice the SFX will overlap the BGM), and then have a Peach throw fourteen to fifteen turnips up into the line of fire. They should all get caught in the line of fire, creating a 'black hole' effect. Now Ness, Fox, and Falco can stop what they are doing. You'll notice all the objects have created this black hole, and you can just walk into it to take 999% damage. It's awesome.
Anyway, I just had to share that. ^_^