Oh well. At least you watched the ending 1st!..
I can think of two movies I never watched the ending of. Monte Walsh was one. After the cowboy rides his horse off the cliff (try and get a real horse to do that btw) I told me wife "If the girl dies that it, I'm done," I swear in the next scene she dies.
The other was Centennial. Told my wife if this things starts at the dawn of time I'm done. Sure enough it started with the earth cooling. She watched and told me I didn't miss much.