Animal Crossing: City Folk Glitches

The nook glitch
Like the others, this glitch recquires more then one person and the final upgraded version on nooks. On the bottom floor, back away as far as you can from the sign above his register. At the count of three, rush into the small crack in between it, and try to get your friends to get there just seconds before you. If this is done right, you'll be pushed into the wall and into the black outer part of the store. There's not much space, but if you save while in this you'll be pushed even higher, and will appear as a huge character right above nook.