(When my DM was helping us with character sheets he saw the chalk was very cheap and weighed nothing so asked of we all wanted 10 free pieces of chalk. We all said “why not!” Except our paladin who steadfastly refused to take any no matter how we pushed him. He just didnt want it.)
Later in the dungeon…
Paladin: I cast detect evil
DM: You detect evil. Behind you.
Paladin: I turn around
DM: You see a faint evil glowing from everyone’s bags except yours
Paladin: It’s the chalk!!
DM: Yes, it’s the chalk
*everyone laughs uproareously*