Poll: Great Movies With Surprise Endings

Douglas "Wrong Way" Corrigan on a July 17, 1938 trip from New York to California lost his bearings due to cloud cover and mistakenly flew east instead of west. The next day, he landed unexpectedly in Ireland after a supposedly unplanned transatlantic flight. In honor of "Wrong Way" Corrigan Day and other surprising turns and shocking outcomes: Which movie that took a likewise surprising turn of events and ended with an unexpected conclusion is your favorite? Discuss the topic.