This timid guy goes in to a rowdy bar on a business trip. There's a monkey with a collar and chain in the bar, and when the customer asks the bartender what the deal with the monkey is, the bartender get's a 20 from the customer, yanks the money and slaps it really hard and the the monkey performs fellatio on him.

After the bartender is satisfied, he asks the customer, "Only 20 bucks, you wanna try it?"

The customer says somewhat sheepishly, "Ok."

"But could you not slap me so hard?"