41. Losin' It (1983)
Cruise's first starring role came in this early 80s teen comedy, which finds the actor (alongside a young Jackie Earle Haley) trying to lose his virginity whilst firework shopping.
Simply put, Losin' It is a remarkably dull affair, and its themes of sex and identity are handled with careless blunt force and crass oversight. Cruise, meanwhile, is on auto-pilot, not yet ready for what his career would soon become and showing none of the spark that would make him a star.