Here's a relatively fun one to do over and over again: Pick 3 completely random things and buy them. Watch the cashier attempt to make connections and come to horrible, horrible conclusions. Example: I walk up to the counter with sausages, vasoline, and sleeping pills.
1. Look at name tags and gather names to then ask random employees random questions about other random employees. An example of this would be, Stacy do you know if Mark could tell me Where the baskets Are? And she goes to get mark, and then you ask mark, Do you know if Debra works tomorrow and he asks around and then you ask Debra if she is interested in Mark and then you continue to do this until you have talked to every employee and they all think you're insane, after that, you might be. I dunno. Oh and putting Cola products in pepsi freezers and pepsi products in coke freezers is always fun.