The one that scans inbox for emails from "Kumar" (a DBA at our clients). Looks for keywords like "help", "trouble", "sorry" etc. If keywords are found - the script SSHes into the clients server and rolls back the staging database to the latest backup. Then sends a reply "no worries mate, be careful next time".

More serious, I have a script that uses gitlab and gitlabci that integrates it with FDroid repo and builds and publishes .apk on internal FDroid repo. Each git branch, tag and release has its own publication in the repo where everyone can test the app, also easy to find regressions by using the app before we use git bisect.