Over on Reddit somebody started a thread about TTRPG traditions at their table. I found it funny. You can find the discussion HERE, but I also copy/pasted some of the ones I enjoyed for you all.
So in my house of gaming, whenever someone orders a pizza they win extra exp (+5 in Wod . + 20 IP in cyberpunk. +1D4 in Cthulhu)
Whenever two characters are about to fuck, we are legally obliged to play (or sing) Kiss from a rose by seal.
And whenever something happens to a player irl that may remind them of the ongoing game, they are forced to message me saying "What did you do" (I.E: one of my Cthulhu players found a copy of the King in Yellow when going through second hand dealerships).
If your character has an impressive beard, they get a bonus to social checks. There's often lots of debate about what constitutes a "Charisma Beard", but the GM is the final arbiter.
My players always talk about wanting to "Gandalf", sacrificing themselves so that the rest of the group can live. I will often include a houserule to make it work better (like being able to "detonate" a spellbook, having all the spells cast at once), but so far, no one has done it.
All new characters are rolled with the same oversized wooden dice I got from the dollar store and lovingly hand numbered. I always get a look and a raised eye brow. "Tradition" I say.