There's a YouTube aquarium guy, I believe called MD Tanks who had discus and I think at least a couple of his jumped. He might have made a lid after that. Either way, he eventually gave up on the discus as I recall, though I don't watch too much of that stuff. I think I came across it when researching what I wanted to do with my tank.
Glad that it hasn't happened to you! I left the lid off my community tank for ONE night and two cardinal tetras bailed. Maybe it's just bad luck!