I don't keep a list but when I was a teenager I used to keep a diary, as I had a nosey brother I used to put things in code in it, not a worked out genuine code, just words that would remind me of what had happened that I wanted immortalised for posterity. When I got married the diaries were put in a case with some other mementoes, I looked at them a few years later and I didn't have the faintest clue what all my code words meant.