Bollox been caught again...
Anyway if you're like me and examine the rectus functions regularly you would notice that along with passing wind through the sphincter that its common for particles of cack to also emit with the wind. Hence the skid marks often seen in pants on an old man after a vindaloo.
I would show an example of a more extreme case of shit spraying but I thought these panties from my next door neighbours daugher best illustrated what a mild case of wind can do to what were a very clean pair of panties.