[Inori]

This isn't an exploitation of human nature but rather a breakdown of one of our most vulnerable social norms; humor.

Am I a sexist, racist hater for laughing?
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No. A good joke nearly always strikes someone's nerve(the vegans on tumblr, for example) proving that good jokes strike close to home.
And yeah, if the punchline to a joke about a quadriplegic kid with down syndrome is cancer then you're just a sick fuck. There's a fine line between comedian and sicko and that's what comedians are defined by.

The world's funniest joke, not really that funny..
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• 
  Two hunters are in a forest. As one shoots, his gun misfires
  and blows his arm off. The other one, panicking, calls 911.
  "Hello," he shouts into the receiver "My friend just died!
  What should I do??" "Calm down," says the operator "first,
  are you sure he's dead?" "one second," the guy says. He puts
  the phone and the operator hears a shot. "Okay, what's next?"
  The guy asks.
  

According to a worldwide study conducted by a German scientist who's name I can't remember, that's the world's funniest joke among thousands submitted. To us, it's not very funny. This only enforces my point about relateable jokes (apologies to any avid hunters who find this hilarious).

A joke we can relate to
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• 
  An SQL statement walks into
  a bar, sees two tables and
  asks, "mind if I join you?"
  

Yeah, it's still pretty lame but it probably got a chuckle out of you guys.

Dark humor, why is it funny?
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The thing about dark humor is, it's so fucked up it's laughable.

• what do you call a girl with one arm and one leg?
  Ilean

Don't lie, you laughed. Why? Because, even if you're a total d!ck, you still felt bad for the amputee.


TL; DR
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Humor in itself is too complex to explain in one thread. There's more to it than I put down here and I might expand on it later. I'm getting a sh!tload of coursework now so I'm a bit less active but I'll try to make more guides.