A winning support effort in the 2011 smash hit Bridesmaids was the perfect showcase for Melissa McCarthy’s innate ability to appal as she amuses. However, when at the wheel of her own star vehicles ( The Heat, Identity Thief), McCarthy seems incapable of finding a way to the funny. If only they made GPS systems for senses of humour. The title role has McCarthy taking her alcoholic granny (Susan Sarandon) on a reckless road trip, where jet-skis will be crashed, livers will be trashed and a father-and-son farmer duo (Gary Cole and Mark Duplass) will be pashed. The joke-to-laugh ratio is low at best, and a flat zero during some ill-advised scenes.