Karate chop

A guy was sitting quietly at the bar having a beer when the fellow beside him hauls off and lets drive and knocks him off his stool onto the floor. The assailant looks down and says, "That was a karate chop from Korea."

The first guy staggers to his feet, finishes his beer and walks out.

Ten minutes later he comes back into the bar, walks up to the second guy and goes whamo! and knocks him off his stool. He says to the barman, "When he comes around, tell him that was a mattock handle from Mitre 10."