When I saw the trailer to Shutter Island, a film about a detective trying to solve a murder at a mysterious and secluded mental institution, I immediately guessed that the twist was going to be that the detective was actually a patient the whole time. This made me decide that I didn’t need to watch it and I never looked up a plot summary so I’ve no idea if I’m right.
Ooh, I have a good one. While I was asleep my brain came up with “Late’n’Baked” which was some kind of instant foodstuff for stoners along the lines of Huel. This was apparently funny enough to wake me up.