If I'm planning a game of deathwatch, I should probably not put my playlist of brony songs on. Even though 'The Pegasus Device' would have been an awesome name for a MacGuffin.
If one of my players is a huge fan of League Of Legends, and another one really hates it, I should double check that none of my NPCs' names share the first or last syllables with any of the champions.
If the data the players are after is on a submarine, it helps if I know a bit about how submarines work.
And speaking of submarines, not allowed to complain that I wasted an hour designing awesome xeno sharks when my players remind me that space marines don't actually bleed.
edited 21st Feb '13 12:00:07 PM by onFyre
I like my way better: Ask the GM to let you play a Tiefling bard who happens to be the Anthropomorphic Personification of metal.
-No longer allowed to have Fast Healing greater than my max HP.
-I do not possess, nor do any of my characters have, a "hitbox".
-In GURPS, not allowed to take Vulnerability: Death for free points. Especially not if I'm already functionally immortal.
edited 22nd Feb '13 6:38:51 PM by Muramasan13
Smile for me!- Chaotic Asshole is not an alignment.
- When fighting a monster in a cave, not allowed to just "shoot the ceiling and hope for a cave-in".
- No puns are to be made regarding the facial features of Beholders.
- Ale may have been required for nourishment back in the Middle Ages due to lack of water purification, but I probably shouldn't drink so much as to pass out on the floor in a pool of beer and vomit.
- Not allowed to shout "It's Them!" when attacked by giant ants.
edited 23rd Feb '13 11:01:02 AM by Midna
pearlina brainrot affects millions of people worldwide. if you or a loved one are suffering from pearlina brainrot, call 1-800-GAY-NERDSMy Changeling cannot be a water elemental with 5 dots in Craft and the specialization "Basket".
My first time playing D&D.
DM: You all wake up in a field. To the east you see a fountain, with ornate carvings and runes-
Me: I pee in the fountain.
DM: What?
Me: My crazy old wizard lifts his robe and takes a leak in the magic fountain or whatever.
DM: You can't just-
Everyone else: Yeah, we're all gonna pee in the fountain, too.
Needless to say, I'm not allowed to answer nature's call anymore.
The very best, like no one ever was. Check out my Spider-Man fanfic here! [1]

Sounds like the cast of Lunar: The Silver Star