Bob and his two friends are talking at a bar. 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: '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.'
Bob says: 'I think my wife is having an affair with a horse.' Both his friends look at him with utter disbelief. 'No I'm serious. The other day I came home and found a jockey under our bed.'