I once triggered an automatic deploy that ran a bash script that minified a bunch of css/html/js assets and pushed them to S3, at some path like `/assets/vX.X.X/whatever.css`. Unfortunately, a few of our deploy boxes had Dash instead of Bourne shell, and when it ran on dash it failed to parse the version tag to push and ended up pushing an empty dir to /assets - deleting everything. Fun experience.