Paramount’s The Guilt Trip (12.19), a road comedy about a 60ish widowed Jewish mom (Barbra Streisand) and her downbeat inventor son (Seth Rogen), was snuck Sunday afternoon at the AMC Century City. No reviews until later but it wasn’t half bad — adult laughs, low-key tone, character-driven, no vulgarity, not classic but likable and entertaining and occasionally heartfelt. Pic was exec produced by Rogen and Streisand, directed by Anne Fletcher (The Proposal) and written by Dan Fogelman.

Rogen and Streisand showed up after the screening and did a live q & a that was close-circuited to other theatres. The crowd was packed with impassioned, eager-beaver fans of Streisand’s albums and particularly of Yentl.

Rogen plays an inventor, Andy Brewster, who’s trying to sell a natural-elements cleaner to the big chains without much success. When he discovers that the beloved ex-boyfriend of his widowed mom, Joyce (Barbra Streisand), is living and working in San Francisco, he invites her to join him on a cross-country trip as he tries to sell his cleaner (which has a really hard-to-remember name that kinda sounds like Science Cleaner but is actually Scioclean or something like that) so they can wind up in San Fran and reunited with the old boyfriend. And yet the way Joyce nags and nudges pisses Andy off and puts him in a bad mood half the time.