Funnyman Conan O’Brien was back to work on The Tonight Show Monday night –joking about a scary fall during a taping of his show last Friday that literally knocked the air out of him.

O'Brien laughed about the accident Monday and even showed video of his wipe-out on the hard studio floor.

"As many of you may know, on this past Friday's show I was doing a stunt and I hit my head and suffered a slight concussion. And I promise, if you're a good audience, I'll do it again tonight," O'Brien said during Monday's taping.

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• Andy Richter
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• Concussion
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