That should do it
 

A construction worker comes home just in time to find
his wife in bed with another man. So he grabs the guy
and drags him naked down the stairs to the garage. He
grabs the guy's c***, puts it in a vise, screws it
down real tight and removes the handle of the vise.
Then he rummages around in a drawer until he finds a
hacksaw, which he picks up and displays to the
terrified man. The man, wide-eyed, screams, "Stop!
Stop! You're not going to cut off my D***, are you?"
The husband hands him the hacksaw and says: "Nope. You
are. I'm setting the garage on fire."

That one was posted here before. :|