I worked for a company that actually did periodical restores of backups, and had a smaller scale version of the "Chaos Monkey" (per company procedures, someone would periodically delete on purpose a file at random - it could be part of an important product, documentation, accounts, an SQL database - and we were asked to get it back from backup).

After I got to the "real world", I'm shocked that some extremely large companies (financial institutions that should know better) don't have anything like it in place, and have far worse and untested but expensive disaster recovery plans.