Irrefutable Evidence

Paddy and his two friends are talking at a bar. His first friend says, "I think my wife is having sex 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, "I think my wife is having sex with the plumber. The other day I found a pipe-wrench under the bed and it wasn't mine."

Paddy says, "I think my wife is having sex with a horse."

Both his friends look at him with utter disbelief.

"I'm serious. The other day I came home and found a jockey under our bed."