2 come to mind.
First was a boys V Tournament doubleheader and I had gotten food poisoning about 3 hours before game time. I was in the bathroom until 2 minutes before tip. Then at halftime until the warning horn, then between games same story, and at halftime of the 2nd game. I carried Immodium with me after that for a while.
My evaluation said great job under extreme duress!
Other was a V game and I was U1 all ready to chop for the tip when I reached up to put my whistle in my mouth and ... no whistle. Lucky for me the locker room was outside through 2 gates and on the other side of the pool. When I ran back in, everyone gave me a standing O -- thanks to my partner. Since then I have saved double digits of partners heading out of the locker room without their whistles by asking.