Brian and his two friends are hanging out at a bar. They're talking about life, sports and other guy things when the conversation finally gets around to to their marriages.
His first friend says: "I think my wife is having an affair with the electrician. The other day I came home and found wire cutters under our bed and they weren't mine."
His second friend says: "You know what? I think my wife is having an affair with the plummer the other day I found a wrench under the bed and it wasn't mine."
Brian, surprised by the candor of his friends, decides to come forth with his marital concerns: "I think my wife is having an affair with a horse."
Both his friends look at him, or course, with utter disbelief.
"No I'm serious. The other day I came home and found a jockey under our bed."