From wikipedia, "Interestingly, unlike B.A., the initials H.M. were never explained in terms of what Murdock's actual first and middle name were, and the nickname "Howlin' Mad" were simply attributed to them (although the "H" is said to stand for "Hector")."
Knight Rider
and i m still mad of it because i ve lost the two decisive batles against IIRC Kat the white KIT and the track Goliath the Nemesis of Kit and Michael Knight,
anyone saw them?