House Rule 01: All Farts Are In Character

#1 : All farts are in character.
Every player that breaks wind at the table, has their character have a brief gutteral emission narrated in by the DM. If a ppropriate, the player must also roll on a d20 to indicate the in-game intensity of aroma of the bodily gas.

If the gutteral utterance occurs while the player is sneaking around, any NPC within earshot will roll a perception check in an effort to locate the source of the noise.

The DM does get away with this either, having to instead pin the blame on an NPC in the given setting.