Alien in a Bar

A guy's sitting in a bar having a drink. All of a sudden an alien sits down next to him, licks its finger and sticks it in the guys ear. He's a little annoyed, but doesn't say anything.

The next thing he knows, the alien does it again. This time the guy tells him to quit.

Five minutes later, it happens again. This time he yells at him to stop. Ten minutes later, he finds a finger in his ear.

Finally, he jumps up and screams, " If you don't quit I'm gonna rip your balls off!".

The alien thinks about it for a second, and does it again.

The guy jumps up, pulls its pants down, but there was nothing there! In frustration he asks, "How do you screw?!!"

The alien smiles and sticks his finger in the guys ear.