we had a barbeque after work one day, years ago. The next morning I wrote a minute to the guy who organised it, supposedly from the boss (copying his signature). The minute said that some people had been hospitalised with food poisoning after the barbie, and asked whether the right OH&S & health procedures had been followed. Where was the meat bought? had the barbeque been washed down every 20 minutes according to health regulations? (no such reg exosted of course) we sent it through the internal mail. everyone was watching as he opened it. He read it, flushed crimson with anger, and raced up stairs to have a go at the boss, who knew nothing about it, shaking with anger with the letter in his hand!

a few drinks were required to placate him afterwards.