Get hired as a clerk, and then when anyone tries to ask you anything say something random about Pokemon. Specifically about how much the customer looks like a certain character. The one that they look the least like.
530, go into wal-mart with a battery powered guitar amp and guitar, then grab a cart. Put the amp facing up in the basket and have a friend push the cart while your blasting riffs. (I know from experience) haha
Steal some paint from the store and paint large archways over random doors. Then make a serial-killer face, dye your hair black and pile it on your head in a weird way, and shove people into said doors, laughing maniacally.