[footfootfoot]

I had an American housemate who wrote in Chinese characters and Japanese Kanji when she wanted to write private memos to herself. I never found out what they were, didn't really ask.

At a bike shop I once worked at we often had to repair flying pieces of crap that should have been junked but the folks who owned them couldn't afford to buy a new bike. Usually they were sensitive and emotional about their bikes for a variety of reasons. When one of those kevorkian bikes would come in, the mechanic doing triage would write on the repair slip MSR (make shit run) Once, a sharp eyed customer noted that the mechanic wrote MSR and not "tune up" as she had requested. I was a few feet away watching his face freeze and go sort of white while his cpu clocked 100%.

"Umm, it's a note... to let the mechanic... who... works on the bike... to Make Sure it Runs."
She seemed satisfied if a little suspicious.

I've blotted out the really embarrassing ones.