A chum of mine was having a hard time with the local council. It was a dispute over our famous 'poll tax' if I remember right.
Anyway, for whatever reason, and no doubt having lost his temper already, he threatened to crash his plane into the offices of the local council.
My, how they laughed.
Seeing as he was then an FO with a well known uk IT operator, they called the chief pilot, who grounded my chum immediately.
I should stress that he was a perfectly normal guy, well as normal as most pilots I know anyway.
Eventually, he went back flying with the same outfit, and indeed went on to get his command which as far as I know he still has.
Moral of the story? Losing your rag and saying something stupid may cost you money, seniority etc, but it doesn't mean you are stone mad.