Random key bashing in vim can have a lot of unforeseen consequences for whatever poor file you had opened.
Given I never intentionally start vim, it's generally when I get thrown into editing some temporary file or other on some system where I haven't configured an editor. Not done any harm in the last 3 decades, so I think the odds are decent.
If you open any file and just type "DZZ" (in capital), you delete the first line of file and save and quit.
(yes, I can usually get out of vim "properly" these days)