There once was a man...

So there was once a man that was born with only the head of a penis.
He lived his whole life like this, never having a girlfriend for fear of being intimate.
When he turned 21 he went to a bar, to drink away his troubles. He ordered a beer and downed the whole thing with a disgusted look on his face. He felt a twitch in his pants, and went to the restroom, and his penis had grown an inch. He was utterly surprised, and ran out to get another beer. This added an inch, he drank another, and another... he had five more beers... and then he had his final beer. His penis swelled and exploded.
The moral of this story is to quit while you're a-head.