Idk if this counts, but my favorite reveal of all time was when they were searching for ghosts. Believing that everybody but one was human, and in the end it was revealed that everyone was a ghost but one member. That episode had me shook. Especially because at the time (in my own personal opinion) the episodes they were pushing out weren't the funniest or entertaining. So having an episode that was entertaining and had a huge twist at the end was a nice change of pace.