Polo Assless Chaps, anyone?
How about a Vinyl Dungeon Restraint System?
Stocked up on Poo Pills?
Seems the gang at Cockeyed.com noticed that Costco goes pretty low-end on their signage, what with keeping up the illusion of an actual warehouse - albeit one that hands out chicken chunks and cheesy poofs.
Since pranks are what they do, man, they printed up some price labels of their own and strategically placed them in assorted Costco stores. Hilarity ensured.
Warning - do not purchase the Poo Pills if you're going to wear the Assless Chaps. Trust me on this one.