A prison in Germany was forced to change 600 locks after an intern mistakenly shared pictures of keys on social media.
The prison trainee reportedly took a photo of himself inside the prison with a master key, which locks all cells and passage doors. A picture of the master key could be used to recreate the key by a specialist.
Local media reports that the intern wanted to show off to his friends how great his new job was.
We say it was, because he is now fired.
The cost to replace all the locks was around $60,000.