Hot Tub Time Machine 2 (15)

Lou Dorchen, his childhood pals Adam and Nick and Adam’s techno-savvy nephew Jacob have exploited time travel for personal gain. In particular, Lou has become a self-centred boor. During a massive party at the Dorchen residence, the lights go out and someone shoots Lou. With time of the essence, Nick, Jacob and Lou add nitrotrinadium to the hot tub so they can travel back to before the ill-fated shindig and stop the gun man or woman from pulling the trigger.