Stephen Hawking jokes

What's the difference between Stephen Hawking and the computer he's hooked up to? The computer runs.

Why is Stephen Hawking a bad role model? -- He doesn't stand for anything.

Why does Stephen Hawking do one-liners? -- Because he can't do stand up.

What is black and sits at the top of the stairs? -- Steven Hawking after a house fire.

What did Stephen Hawking say when his computer crashed?

Nothing.