Originally posted by Fleet
That's what I would guess. Maybe he knew also knew a little about some other form of fighting (maybe a marine taught him).
Anyway, it's just another mystery about The Fonz.
I seem to remember he had a female karate teacher (who even made him a special belt - leather maybe?) similar to when he had the "expert" fencing teacher girlfriend that allowed him to beat that french guy Jacques(?) that was the visiting world champion (and came to Milwaukee for some reason?).