A man walks into a bar and sees a donkey standing in the corner. Around the donkey's neck is a sign saying 'IF YOU CAN MAKE THIS DONKEY LAUGH THEN YOU WIN $500.00!'
The man goes up to the donkey, whispers in his ear, and the donkey starts laughing hysterically. The man then goes to the bar, collects his $500.00 and leaves. Anyway a year later the man visits the bar again, and sure enough the donkey is there.
This time though the sign says 'IF YOU CAN MAKE THIS DONKEY CRY THEN YOU WIN $1000.00!' The man walks over to the donkey, pulls his pants down and up, and walks away. The donkey in the meantime is crying hysterically. The man goes to the bar and collects his $1000.00.
As he is leaving the barman says, "Hey man, you came in here a year ago and made the donkey laugh, now you come in and make the donkey cry. How did you do it?"
"Well," said the man, "First I told him my cock was bigger than his and today I proved it was!"