There were three pigs.

The first pig went to a bar, ordered a drink, gulped it down, went to the bathroom, and then left.

The second pig went to the same bar, ordered a drink, gulped it down, went to the bathroom, and then left.

The third pig went to the same bar, ordered a drink, gulped it down, and was just going to leave, and the bartender asked if he was going to the bathroom. The third little pig said, "No, I'm the little pig that goes weee weee weee all the way home."