This has always been the fun part of programming to me. I know most people hate it, but I really don’t mind being on-call (ok I hate being woken up) and fixing weird bugs that users run into. All these small edge cases that people run into because reality is odd. Of course I’m in scientific programming so that probably colors my view.
It’s always a little disappointing to me when I think I’ve run into something unique but it ends up being user error or something.