Why jokes

Why couldn't the astronaut put the helmet on his head?

Because he didn't have enough space.

What is the world's greatest invention? The ball gag, do you know why? Honestly, officer, I never heard her say no.

Why do people say "cheese" when they are taking a photo?

Because they were using the computer and thought about it.

Why couldn't Professor Xavier fight Magneto? Because he couldn't stand up for himself.