There are few.
A very nice Blood Elf female rogue that gave me the useful tip that I would do more damage if I used a staff instead of a fishing pole.
The first time I ran Deadmines (classic). I still love that dungeon and was sad to see it changed.
Getting killed by a yellow mob because “How hard can they really hit”. The answer is hard.
Getting killed by Stitches.
Getting killed in Tarren Mill because who knew helping to summon an infernal would flag me for pvp.
Daze, daze, daze, dead many mobs from many different xpacs.
Stunstunstunstunstn dead many rogues why?
Then there are the guilds I was and one that pushed me out of my comfort zone to try something new. It was fun and I miss that community.