Brian and his two friends are at a bar. They talk about life and sports until the conversation turns 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 plumber. The other day I found a wrench under the bed, and it wasn't mine."
Brian, surprised by his friends' candor, decides to share his own concern: "I think my wife is having an affair with a horse."
Both friends look at him with utter disbelief.
"No, I'm serious," Brian insists. "The other day I came home and found a jockey under our bed."