Actually, I just learned something. I always thought farts were composed mostly of methane...but from
Wikipedia:
Quote:
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The remaining trace (<1% volume) compounds give flatus its smell. Historically, compounds such as indole, skatole, ammonia and short chain fatty acids were thought to cause the smell of flatus. More recent evidence proves that the major contribution to the smell of flatus comes from a combination of volatile sulphur compounds (VSC).[5][12] It is known that hydrogen sulphide (H2S), methyl mercaptan, MM (also known as methanethiol, MT), dimethyl sulphide (DMS), dimethyl disulphide (DMDS) and dimethyl trisulphide (DMTS) are present in flatus. The benzopyrrole volatiles indole and skatole actually have a mothball type smell, and therefore probably do not contribute greatly to the characteristic smell of flatus.
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Then there is this (starting at about 1:50):