Conan O’Brien returns after concussion

LOS ANGELES -- Conan O'Brien is back at work on the "Tonight Show" and joking about a stunt accident that gave him what he calls a slight concussion.

O'Brien hit his head during Friday's show, halting the production and sending him to a hospital to be checked out. A "Tonight" rerun aired instead of the planned episode.

In his monologue for yesterday's taping, O'Brien said he was asked all weekend about what happened. O'Brien told the studio audience that he hit his head so hard that for five seconds he understood the plot of "Lost," according to an NBC transcript.

When he fell, the "Tonight" host was doing a stunt with guest Teri Hatcher of "Desperate Housewives."

-- The Associated Press