Stepping on toes and tangling with rejection, the women behind this "girl's movie" touched millions despite co-star tension and a meager budget.

Mix a "comedy machine" with a novice director. Add a shutdown threat, rotating robbers and terrifying stunts to home in on a ho-ho-ho holiday megahit.

A rickety script, tight timeline and effects issues almost busted this comedy. But thanks to Dan Aykroyd and company, the slimy shenanigans took off.