Ist zwar nicht direkt D&D, die Thematik passt aber:
A human, an elf, and a dwarf are walking down a trail beside a stream, and they stop to take a piss.
After, the human takes out some soap and begins washing his hands.
"We humans have learned how to be clean and hygienic," he says to the others.
The elf begins picking some leaves off the trees and wipes his hands with them.
"We elves do as tradition has taught us and use what nature has provided."
The dwarf, meanwhile, has pulled up his trousers and is already on his way down the trail.
"And our ancestors," he calls back, "taught us dwarves not to piss on our hands!"
@Greifenklaue: Seltsam, ich seh da gar nix …