The Brown Noise

The bard who starts to play this noise sets off a chain reaction. As the noise invades your mind, everyone within a 30 foot radius must make a constitution saving throw. Anyone effected takes 3d6 psychic damage on a failed save, or half as much damage on a successful one.

If you succeed on the saving throw, you let out a loud fart and the spell stops effecting you. If you fail the saving throw, you immediately shit your pants, and have disadvantage on all stealth and charisma checks and saving throws until getting cleaned up.