For me, whenever any of the following 3 movies are on, I MUST WATCH!!
- Goonies
- Jumanji
- Zathura
Yep, watching “Zathura” right now.
I think we just had this subject because I was going to post
Apollo 13 and
Moonstruck.
don’t remember if I actually did or not.
Anything by Mel Brooks.
Og forgive me, Independence Day.
The Sting both for the story and the music.
Alien 1-3
"Yeah? Well, Jim Tobelson is a Goddamn ‘Chatty Cathy’!"
By the way, I am really am pretty swag, as you might be able to tell by the three movies I posted.
No Time For Sergeants
Sergeant York
Auntie Mame
Dances with Wolves
Out of Africa
Anything with Jenna Jameson 
Don’t have a particular one, but in general I never turn off a movie on tv once I’ve started watching.
Now if you’d included tv series, most of which I can stop watching at any time, my pick would be 24, and going back a ways Twin Peaks.
Heathers
Lost Boys
None that I won’t turn off.
For can’t turn off, there’s Twilight Zone 
Zulu with Stanley Baker and Michael Caine. Too many great moments.
Outlaw Josey Wales
My Cousin Vinny
**Spartacus
The Day the Earth Stood Still
Young Frankenstein
Charade**
The Patriot
Three that immediately come to mind: Casablanca, The Producers, and Wait until Dark.
To those I’d also add From Russia with Love, Stalag 17, The Great Escape, Psycho, and American Graffiti.
Moving to Cafe Society.