Well
Rectal sphincters sometimes open wide... ... and the tissue decay means there's a lot of internal pressure.
(smellysamlyingcableSeaman on, Sun 2 Aug 2015, 12:54,
Reply)
you had me at rectal sphincters!
(Firkinfeduplast shat on your wife's tits at, Sun 2 Aug 2015, 12:56,
Reply)