More than often if I can't find anything on TV to watch. I will watch a movie that I have seen many times if it is on cable. Here are some the movies I'll always watch.

Carrie
My Girl
Basic Instinct
Field of Dreams
Tommy Boy
Black Sheep
Dumb and Dumber

These days, since I have a huge movie collection, I try not to watch something I already own on DVD. That's the way I am. But to answer your question, even though I don't have this movie yet, but it comes on cable all the time, I can't help but to watch it: "Overboard" with Goldy Hawn and Kurt Russell. The reason I don't own it is because it is on TV all the time. I will get it eventually, but I am trying to miss the movie for now. LOL

Aside from the Star Wars movies, classics like Godfather 1&2, The Great Escape, and Patton are movies I will drop whgatever I am doing and watch them.

The Terminator, The Towering Inferno, A Women Scorned: The Betty Broderick Story, and some others that escape me now.

I can never seem to resist "Seems like Old Times", "Abbott and Costello Meet Frankenstein", "The Good, the Bad and the Ugly", "Jaws" and "Star Wars".

Sleepless In Seattle
It Could Happen To You
Dirty Dancing
My Girl (just saw this the other day-I had forgotten what a good movie this is!)
Pretty Woman
Shall We Dance?
Stepmom