why do farts make me laugh so much?

Lol so i was waiting around the shop for my friends and there was this man sitting on a wall across from where i was standing and i heard a "pppfffrrtt" and i burst out laughing to myself, then a few seconds later he walked away lol..

Do you think farts are hilarious? :)
Im not an idiot and i have a sence of humour :D
 
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