There's a hitch-hiker waiting for a ride, and then a semi comes along, and the driver decides to pick him up. So after a couple of minutes of silence, the truck driver asks, "Hey, wanna see a trick?"

"Sure," replies the hitch-hiker. So the driver calls up a monkey from the back, smacks² it, and it gives him a blowjob.

"Hey, you want some of this action?" asks the driver, and the hitch-hiker replies, "Sure, just don't smack¹ me so hard."