'Cowboys & Alien's' Harrison Ford Rips Smurf's Head Off on Conan (Video)

He admits wife Calista Flockhart took their 10-year-old son to see the Smurfs and they're going to "try to get" their money back.

Harrison Ford's Cowboys & Alien's narrowly beat The Smurfs at the weekend box office ($36.4 million vs. $35.6 million) -- no thanks to his 10-year-old son with wife Calista Flockhart, Liam.

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"My wife took my son to see The Smurfs," Harrison deadpanned in his trademark gravely voice on TBS' Conan Monday night. "He got into my movie for free, and so she took him to see The Smurfs."

When Conan O'Brien asked if he was mad some of his money went to pay for a competitor, Harrison said, "We're going to try to get it back."

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Conan then handed Harrison a Papa Smurf doll, and told him to take out "anger or rage" on it.

Harrison ripped its head off as the audience applauded.

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Smurfs and Cowboys & Aliens engaged in a neck-to-neck weekend box office race, with Smurfs performing better than expected due to the nostalgia factor of its '80s TV show and a younger-skewing audience.