A man walks into the dentist's office and after the dentist examines him, he says, "That tooth has to come out. I'm going to give you a shot of Novocain and I'll be back in a few minutes.   The man grabs the doc's arm, "No way! I hate needles.  I'm not having any shot!"  So the dentist says, "Okay, we'll have to go with the gas."   The man replies, "Absolutely not! It makes me very sick for a couple of days. I'm not having gas.   So the dentist steps out and comes back with a glass of water.  "Here," he says, "Take this pill."  The man asks, "What is it?"  The dentist replies, "Viagra."   The man looks surprised. "Will that kill the pain?" he asks.   "No," replies the dentist, "but it will give you something to hang on to while I pull your tooth!"