Grandma’s Boy, a low-gas frat comedy about a 35-year-old videogame tester (Allen Covert) who moves in with his grandma and her two friends, does a very thorough job of reducing every recognizable member of the cast to probable career lows. Everybody Loves Raymond‘s Doris Roberts, as Grandma, gets stoned, chugs a beer, burps, and crushes the can. Partridge Family mom Shirley Jones, suggesting a Golden Girl gone wild, puts a virgin geek’s hand to her breast before she wrestles him to bed. Broadway vet Shirley Knight licks paint. ER‘s Linda Cardellini — not you, Linda! — grabs her own ass while she karaokes Salt-N-Pepa’s ”Push It.” None of this works — the car-driving monkey in the last act upstages them all — but at least give the ladies credit: They all, to a woman, commit. Which makes it all the more embarrassing that the movie’s so lame. But what inspired their trust? Possibly the fact that the exec producer is Adam Sandler, who clearly pulled this movie together for his friends — director Nicholaus Goossen and Covert (who also co-wrote) are longtime Sandler pals — but showed enough sense to stay otherwise far away.