I like placing a Barbie on a shelf surrounded by all those green plastic military men. It makes it look like a USO show.
They love talking in numeric codes over the loudspeaker so customers don't know what it going on....so....Go up to Customer Service and tell them they have a 302 in the ladies' room. If they don't hurry, it will turn into a 504.
Back when "The X-Files" was a big hit, I used to hear the announcements for a CSM (meaning Customer Service Manager) to come to whatever department needed them. If there were people around, I would ask aloud; "Why does someone need a Cigarette Smoking Man?"
Is there anything you have done, or would love to do in a Wal-Mart?