Give it up for Sandra Bullock and Melissa McCarthy. You'll never see them work harder at comedy than in “The Heat,” a stumbling, aggressively loud and profane cop buddy picture where they struggle to wring “funny” out of a script that isn't.
Plot? It's more a collection of scenes that force the stars to riff and riff until something coarse and amusing comes out, topped by something else coarser and more amusing. Instructions must have read, “Sandy and Melissa go to a dance club, where Melissa hacks off chunks of Sandy's costume to make her 'sexy.'” Or “Melissa and Sandy get drunk in a bar and line dance.”