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Robert Downey Jr.: TKO!

Photo Credit: Jaded4Good

A freak accident on the set of Robert Downey Jr.'s latest movie was less 'Iron Man' and more iron chin.

The Sun reports that Downey Jr. was knocked unconscious when a 350-pound stuntman accidentally punched him during a scene they were filming for 'Sherlock Holmes.' According to the report, Downey Jr. was "out cold" and was "drooling blood" when he came to.

An insider tells the Sun that the 'Iron Man' and 'Tropic Thunder' star was "accidentally caught on the chin by a thundering hook. He went flying and was out cold."

The source says Downey Jr. "didn't want to go to hospital and kept trying to get up. He's a trooper."

The Sun also reports that the day after the incident, Downey Jr's costar Jude Law (Dr. Watson) had to scramble to safety with director Guy Ritchie when a gas tanker exploded.

"The crew have started joking about the curse of Sherlock Holmes." the source said.

(I blame Madonna...!)