*Bring a bunch of friends, try on a bunch of clothes and pretend that the whole store is a Runway, and pose in front of random people.
*Bring your rock climbing gear and try to climb up the aisle sides. Make sure to bring a helmet!
*Follow around an employee and read "HOW CAN I HELP YOU?" in a really loud voice that's on the back of their uniform.
*Grab some soda cans, shake them up and spray them in people's faces as they leave and scream at them, "COME AGAIN".
*Wear a Darth Vader mask with the voice changer and stand next to the greeter. Say to the people entering, "Welcome to the dark side."
*Hop in random people's carts and scream "Go go go!!!"
*Buy a bunch of key chains, like 40, then return them, then buy them, then return them. . .you get the idea. End with returning.