Acting John Mainieri Biography John Mainieri is an actor. Acting Wonder Wheel John 2017 Trainwreck Mob Bar Bartender (uncredited) 2015 The Normal Heart John 2014 Cars 2 J. Curby Gremlin (voice) 2011 When in Rome Man in Elevator 2010 Cayman Went Hans Kopechne 2009 Meet Dave Middle-Aged Man 2008 Agent-readable