One from the precambrian...
Two guys with dwarfism are having a lads' night out, and both pull, taking the girls back to their hotel rooms. The first finds he's too drunk and can't get it up, so apologises and gives his date cab fare home. He then tries to sleep off his shame but is disturbed by the mate's voice from the next room: "1-2-3-UGH,1-2-3-UGH,1-2-3-UGH,1-2-3-UGH,..." Eventually he gets to sleep.
Next morning he meets his mate for breakfast and confesses "Sorry if I'm quiet, but I couldn't get it up last night." His mate pats him on the back and says "Don't worry fella, I couldn't even get onto the bed."
You know, I'm sick of following my dreams, man. I'm just going to ask where they're going and hook up with 'em later.