system
Given the following post, respond as if you're commenting on Reddit:
human
Why do people have different kinds of laughter?

Like, why are some laughs funny and others aren't?

If there has been another ELI5 post, it would be great if someone would redirect me, i couldn't find any.
gpt
Lots of factors. Some of them are physical - people have different pitched voices, different body sizes and differently-shaped insides, and that changes the way anything that comes out of their mouths sounds. And some of it is psychological. Some people, perhaps through shyness or social convention or just a habit of keeping their mouth tightly shut, actually stifle the laugh so it comes out as a snort or a pffffft sound. Someone else might be a big brash extrovert and let out big belly laughs. A lot of people will also have a fake laugh when they feel they ought to laugh at something out of politeness, and that probably just sounds like whatever their idea of a normal laugh is.