Blame Apple too
When my wife, now a very senior doctor, was starting out in General Practice I decided to have a play with her iPhone and edit the auto-correct settings. She didn't really use email on the phone, just text messages to me and various friends and family, nothing professional. I didn't do anything very rude, more silly, like "yes" changed to "okelie dokelie", "no" changed to "nodelie dodelie" etc. I don't think she even really noticed but it probably amused a few people.
What I didn't realise is that iCloud (I think it was called MobileMe back then) syncs lots of things, including auto-correct settings. So Apple Mail on her MacBook happily rewrote the contents of all her emails to use the silly phrases. Which she sent to managers, supervisors, patients, her professional college etc. for several weeks. Fortunately she spotted it and instantly blamed me before she sent anything potentially career damaging.