When I saw Rhett's Whodunit contest it made me think of movies where when you find out whodunit you say "hm, i didnt even know he was in the movie" and then turn off the teevee. Slashers or gialli seem to be notorius for this. The worst offender I can think of is F13 part 5. Id almost rather turn it off just before the reveal, it would make the rest of the movie so much more enjoyable. Are there any that leave you flat?