I don’t know how fast, but one was hot enough to set my college roommate’s jeans on fire.
Old farts travel about 15 mph for at least 10 miles.
What causes hang-time? I always thought it was due to leakage and one’s not necessarily smelling gas, but the actual feces splatter against the inside of the underwear.
Gotta ask – did you then dump on the doorsteps?
Only on the Dope.
Didn’t Cecil do a column on some Japanese toilets that have fans installed inside them (or some such), in order to er, eliminate that smell of expelled gas in public toilets? Or am I now confabulating Dope columns as well as experiences in my real life? 
Nice article in wiki. And no discussion of farts is complete without mention of Le Pétomane or providing visual aids via YouTube.
Young ones are allus walking across my lawn at about 2 mph.
Bastards
And the underwear staining is at the speed of browned.
Yeah. And also, when you fart in Danish elevators, you have the option of alerting your fellow passengers. Such a polite country.
I should also mention the effort the Danes are making to reduce emissions on their highways.
So, have I helped to fight ignorance by asking this question?
Can I expand (hehe) the question? How compressed is the gas before emission?
I wonder if certain farts are denser than others, thus causing more hang time.
Guy lights candle with fart:
Gotta love the grunt of determination!
LOL. Too much determination leads to premature defecation.
The signs of the prophets are written on the bathroom stalls:
Here I sit all broken-hearted;
Came to shit and only farted.
[Reply]
Don’t you bitch, you had your chance;
I tried to fart and shit my pants.
Are these invisible feces, 'cause i have never noticed any skidmarks after even the most pungent and durable barking spiders.
Pray you never see the lolcat for this.
That would be an lolshat.