Movie lines people laughed at in theaters despite not actually being intended to be funny?
I remember in Revenge of the Sith, when the actor playing Vader yells "nooooooooo", at what is supposed to be the emotional climax of the trilogy, the theater roared in laughter.
Steven Seagal's death in Executive Decision was supposed be a dramatic moment instead the theatre I was in broke out in spontaneous clapping, laughing and cheering.