How about sharing a few hangar flying stories? I'll start:

A friend of mine was flying his glider in a contest. He had been out
on task for some time, and still had a way to go when nature called.
He had no relief system in the glider but a search of the cockpit
turned up a latex glove.
Ever the creative souls that we glider pilots are, he started using the
latex glove to relieve himself, one hand on each "stick", just as he
entered a thermal. At the top of the thermal he looked down and saw
that the glove had ballooned alarmingly from low altitude to high. A
delicate attempt to remove the balloon met with disaster and needless
to say there was a urine explosion. Reportedly a hand towel, goggles,
and a squeegie would have been helpful in the aftermath. I can just
hear the cursing and see the erratic glider maneuvering following the
explosion.

Any other funny stories? Unexpected passengers like mice or wasps?
Perhaps some of you may be inclined to offer up an anecdote for the
rest of us.