A man walked into a bar and ordered a hot dog and a beer. He downed the beer. Then he put the hot dog on his head, smashed it with his hand, and walked out the door before the bartender could say a word. The next day, the man returned and ordered the same thing. Again he downed the beer, and again the bartender watched in amazement as the man smashed the hot dog on his head. The man came back the third day and placed his regular order, but this time the bartender said, "I'm sorry, we're out of hot dogs."
The man said, "Okay, give me a bag of potato chips." Then he downed the beer and poured the bag of chips onto his head before smashing them with his hand and heading out the door.
"Wait!" called the bartender. "Why did you smash those chips?"
The man replied, "Because you didn't have any hot dogs."