I usually have error logging/reporting with full stack trace. This was a quick one-off that I definitely didn't mean to commit! One web app that I worked on yea

I usually have error logging/reporting with full stack trace. This was a quick one-off that I definitely didn't mean to commit! One web app that I worked on years ago would save the entire session state of the user on error. We had a dev tool that would allow us to jump in with all of our session state all set exactly as this user on the exact spot where they had the error. It was pretty great for reproducing most errors except one pesky one that would show up in the logs randomly. Finally, one day I accidentally triggered that annoying error by doing a specific sequence of things and then clicking the browser back button a few times, then doing another specific sequence. That was a day of celebration!