I imagine the pitch meeting went like this: "Producer: We got Barbra Streisand, we got Seth Rogen, we get 'em in a car. Release it around Christmas. I mean, you gotta take grandma somewhere during the Holidays. Executive: Are there life-lessons involved? Producer: Does the Pope crap in the woods? Of course there are."
Lo and behold, a year later, these two guys found themselves at the premiere for 'The Guilt Trip,' a movie that didn't cost too much to make and won't make that much of an impact but will empower everyone involved to one day strike again.