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VIDEO: Watch Conan O’Brien Hit His Head

Ouch! The host of ‘The Tonight Show’ goes down for the count following a mini-triathalon with Teri Hatcher.

Ouch. That’s the unavoidable reaction to this clip showing Conan O’Brien’s Friday mishap, in which he hit his head and had to be taken to the hospital for observation. O’Brien was filming a bit with Teri Hatcher in which he and the "Desperate Housewives" star square off in a mini-triathalton. O’Brien gets through most of the stunt safely… until the very last minute. Check out a preview below (and watch the full segment on Monday’s "Tonight Show").