Whats your favorite "hold up, wait a minute, yall thought I was finish" movie?

[valet]

What's your favorite movie where you thought it was over. But then they introduce someone or a new concept? And the movie goes on for another 20 minutes. But its actually good. Not a false ending where they just drag the film along

 

[PatCake]

Alien (1979)

I reallt thought Ripley was safe and on her way.

First time I watched it I even got up and went to the kitchen. A minute later I hear this banging sound and a scream. Alien breh was hibernating all along.