I can think of two. Time Bandits and Paint Your Wagon.
Wow, I hadn’t thought of “Time Bandits” in decades. I remember watching it in the early 1980’s. I don’t know if I would call it boring as much as really bizarre and...very British. It was one of those movies that I just sat there as the credit rolled and said to myself, “What the heck did I just watch?!? A kid, time travelling dwarfs, the Devil, God, a magic map and evil rocks in an oven?” Another movie I found very similar was “The Adventures of Baron Munchausen” it had the same bizarre very British feel, maybe even more so then Time Bandits.
I saw Time Bandits with friends who raved about it. I felt just like Elaine in that youtube video about The English Patient.
Both directed by Terry Gilliam, who was the only American member of Monty Python.