Mel Gibson was spotted Thursday in Las Vegas, NV., but not engaging in the kind of festivities one might expect from the actor in Sin City.
Gibson took his 10-year-old son Tommy and two pals to "Bodies," a three-dimensional look at human anatomy, at the Luxor Hotel & Casino.
Gibson's group enjoyed a 90 minute tour of the exhibit, where we're told he asked plenty of questions and even quizzed his son about they'd learned.
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Gibson, sans brood, attended another attraction later that evening, hitting up The Mirage's ventriloquist act Terry Fator & His Cast of Thousands.
Onlookers said Gibson laughed heartily throughout, and later joined Fator backstage for a photo.