Oh boy this is tough.
1. Any Avengers movie
2. Jurassic Park
3. Groundhog Day
4. Aliens
5. Terminator 2
After number one, really any of at least 15 movies could be in the top 5. More Marvel stuff, Predator, 12 Angry Men, some Audrey Hepburn flicks, Casablanca, Return of the Jedi, Naked Gun . . .