9 years ago I was working for a major broadcasting company in the arse end of London as a junior dev, building one of their Android apps.
We'd roll features out months before & enable them with feature flags via a json file we'd manually push to a prod server at a later date.
We'd just built a huge new feature letting you request content to be downloaded to your set top box remotely & it had a 250k marketing campaign to go along with the launch.
Senior dev trusted me with prod deployment rights.
I pushed the wrong json config to prod, launching the feature weeks before the marketing campaign.
Thank god I was a junior perm, that was definitely a firing offence.