Because the noise of a fart is sometimes loud and hilarious, or the person is trying so hard not to embarrass themselves by laughing about such a childish thing that they do laugh. Its called reverse psychology. But for "silent but deadly" farts, they just laugh to laugh. I don't know, the idea of farting is just FUNNY! :D :D :D :D :D. and it is just flat out funny too see them squench and
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squeeze there face.... lol ~|~
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It is unclear why people laugh at or about farts, it can be because when a person farts it is embarrassing. If we laugh at ourselves passing gas then we are less likely to be embarrassed if someone else laughs at us.
Because when you laugh you laugh so hard that you force the gas/fart to come out.
Why wouldn't they... As you said, "Funny"
your farts feel the need to express themself, in a way that no other can, making 'funny' noises as they come out of your anal area.
Farts are called farts because in 1801, my great great great grandfather, Pooper Scooper, started calling them farts and it caught on. People started using the word, “fart”.