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.
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.