A gripe sheet...

A gripe sheet. Supposedly true “gripes by pilots and the responses by ground crew”. If they are true – they show the ground crew has a really good sense of humor. My top favorite on that page (it was really hard to choose):

Problem logged: Friction locks cause throttle levers to stick.
Solution described: That's what they're there for.

I liked that most of all because it is somewhat similar to some answers I’ve given in the past myself. “It is supposed to do that”.

It was either that one or the “cannot reproduce on ground” answer.