Things my brother and I have been banned from doing to crush a GM's soul:
(We've actually done these)
- Reenacting Monty Python's Dead Parrot sketch with the party's recently slain wizard.
- Creating rival rogue characters based on Miguel and Tulio from Road to El Dorado.
- Having our characters do the Ginyu Force pose before combat.
- LARPing the Ginyu Force pose before combat.
* No longer allowed to turn to my brother and ask 'Are you pondering what I'm pondering?' in a deep voice.
** My brother is no longer allowed to respond with 'I think so brain, but we'll never convince the DM to put on pantyhose for that trick.'