I've done movies that were maybe not worth it, but I try to take the best from every experience. You learn more from bad experiences sometimes. It gives you more will to overcome your mistakes. They give you determination.
I did a smaller gig with an acoustic guitar and a drum machine. In one song, something wrong happened with the drum machine. I tried to cover up the mistake by playing faster and improvising a new song but it became crazy, and I had to admit it was all a mess.