What are some franchises that you feel the need to watch over and over again? For me, it's the Friday the 13th franchise. The first four films, I mean.

Raiders of the Lost Ark, Indiana Jones and the Temple of Doom, and Indiana Jones and the Last Crusade
Alien, Aliens
Predator, Predator 2
Star Wars, Empire Strikes Back, Return of the Jedi
Best of the Best, Best of the Best II
Rocky, Rocky II, Rocky III, Rocky IV
Die Hard, Die Hard II
Terminator, Terminator 2
Mad Max, The Road Warrior, Mad Max Beyond Thunderdome
The Karate Kid, The Karate Kid II
The Bourne Identity, The Bourne Supremacy, The Bourne Ultimatum
Batman Begins, The Dark Knight

I also like several movies that either started a movie franchise or are part of them but not necessarily the whole franchise like

Silence of the Lambs
Jaws
First Blood
Beverly Hills Cop
The Matrix
Jurassic Park

the Beach Party movies with Frankie Avalon and Annette Funicello
Star Wars movies (mostly the original trilogy)
the Superman films (mostly the first two movies)
the Batman films

The Man With No Name trilogy.