Stream of consciousness trigger stories

So I'm at home the other day and Mrs. Novelist says to my son, "you need to get a haircut." I was instantaneously taken back to my days in the National Guard. Get a haircut was a mnemonic used by a radio operator I knew -- his name was Wendell James -- for the letter F in International Morse Code, using verbal rhythms. Get a haircut translated to dot dot dash dot, or F in Morse code. From there, I remembered pretty much everything I knew about Wendell James. As a radio operator, part of his job was to put up field radio antennas, and when one was operational, he'd say, "we have achieved and erection." Funny guy, Wendell.

All this from my wife telling my son to get a haircut.

Anybody else have a story like that, where a phrase in conversation or a smell, or some other environmental cue prompted a detailed memory?