Famed unknown prankster Rob Cockerham recently decided to see if he and his minions could stir up a little trouble at Costcos all across this fair land. He printed up price stickers in the Costco shelf format but advertising silly, non-existent products like "Goat Balls" and "Stuffed Zebra" and sent folks out to unobtrusively sneak them onto Costco shelves. Take a look.