Elagabalus' Whoopee Cushion

Origin
Elagabalus was Roman emperor who came to reign at 14 after a series of assassinations and overthrows. He was known for his irreverence of custom over leadership skills among his peers and later rulers. He engaged in multiple religious and sexual scandals, including prostituting himself in the imperial palace.

Effects
When sat on, the cushion generates a malodorous gas similar to methane. The gas is flammable, so keep out of reach of ignition sources and fire-related artifacts.