A guy walks into a bar. He says to the bartender "I'd like a Whiskey Sour." The bartender replies "How do you make that?" The guy says "You put in whiskey to make it strong, water to make it weak, lemon to make it sour and sugar to make it sweat. You mix it all together and you say 'Here's to you' and then you drink it yourself." The bartender says "That's not a drink! That's a contradiction!"