A man walks into a bar and orders a beer.  The bartender puts a coaster and a beer on the bar.  Ten minutes later the man orders another beer.  The bartender brings him the beer and sees that that coaster has disappeared, so he brings another one.  Ten minutes later, another beer, and again the coaster is missing.  This time the bartender puts the beer down without a coaster. “Hey,” the man says, “what about my cookie?”