Why do we fart? And why are some louder than others?

I was just bored and thought I would ask.
Answers:    we fart out methane gas, if we kept it in we would bloat and die. some farts are bigger than others because when you squeeze really hard all the pressure bursts out at once producing a loud bronx cheer, some can be watery, silent but deadly, some you think are farts but you actually just crap your pants. Farts are awesome, we should all fart in public cause its really fun to. i like to fart in restaurants really loudly because i can do it, and everyones too embarassed to say anything, and then they are forced to smell it also.

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