Why is it that Farts are Hot only occasionally?

Question

It's not often, but it does happen. Sometimes Farts are hot.
I've also noticed that those are the most "pungent & foul" type.
Why?

Answer 1

Maybe it has something to do with what is in there. As food passes it basically rots. As food rots (digested) it is converted in part into methane. Methane is a combustible gas and certainly has some explosive and smelly components. Light a match to em and they will all be hot. Have fun.