Understanding jokes

Why didn't the kid cancer patients like his joke?

He said, "You'll understand when you get older!"

I was wondering why the ball was getting bigger. Then it hit me.

Jacob Wheet, if you don't understand, look it up.

Is sex a joke? Because I don't get it.

Dark humor is like food. Not everyone gets it.

There are 10 types of people in this world.

Those that know binary and those that don't.