The only movie I ever walked out of was King Solomon's Mines.
No, not the classic Stewart Granger one (you know, the one where they went to Africa and filmed on location? The one with some of the most riveting dance sequences ever recorded?) I mean the one with Richard Chamberlain and Sharon Stone, that appears to have been filmed using a highschool gymnasium as a soundstage, and a "recreated from the memory of a 13 year old fanboy" copy of the script from Raiders of the Lost Ark, with the name of Spielberg's characters whited out and Chamberlain and Stone edited in.
It is a truly ghastly movie. I think we left when Chamberlain brushed a rubber snake off Stone's neck, and said, with a perfectly straight face, "it's a jungle out here".
The odd thing was, Chamberlain had just come out of "The Thorn Birds" as a big star, and I think this film killed any chance of that continuing.