What is the worst?

Hi all. When it comes to movies which ones would you say are the worst you have seen? In particular
1. The worst “film”: or movie with real with a real fan base or preview as good by some?
2. The best “so bad it’s good movie”?
3. The worst movie of all time?

For me
1. Watchmen
2. Santa Clause Conquers the Martians
3 Red Zone Cuba