1. Body switches / body takeovers
    When Faith and Buffy body switched, I wanted to throw my tv out the window. The Katherine/Elena body takeover on TVD made me so angry, I didn't watch the show for a year and a half. Note: this is not the same as demon possession plots. Those are my favorite of the horror genre.
  2. Easy fixes
    Anything where everything spins wildly and hilariously out of control just because the protagonist couldn't tell the truth about something small and inconsequential.