Not sure if this one is here already...
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A fellow walsk into his house one day to find his wife in bed with another man. The husband calmly picks up his shotgun and leads the guy, naked, out to his garage. He put's the man's penis into a vise, tightens it down, and removes the handle. As if the guy wasn't in enough pain now, the husband retrieves a hack saw with a dull blade. He fellow says, "You're NOT going to cut it off now!?"
The husband hands the hacksaw to the guy and says,
"No, you are. I'm going to set the garage on fire."