High Noon (1952)
Fred Zinnemann's 1952 western shot in real time. The clock is the antagonist.
Lloyd Bridges played the deputy in High Noon who refuses to help, which is one of the more uncomfortable performances in that film because his reasoning is entirely selfish and entirely understandable.
Sea Hunt gave him a long television lead as a diver, and he did his own underwater work.
Airplane and Hot Shots gave him a second career in parody at seventy, playing authority figures with escalating substance problems. Jeff and Beau Bridges are his sons.