I'll vote "very necessary." Once at the Naval Nuclear Power Preparatory
School, in North Chicago, there was ice on my windshield so thick I
broke the tip off my Herter's sheath knife trying to get it off the
windshield of my car. About 1/4" to 3/8" thick. And that was during the
day in VFR conditions.




One freak time 35 years ago, on a car no less, and that qualifies as
very necessary? Remove head from ass.