If you're at the top of the buffer, guG will lowercase the whole thing.

So if you open a file, go to type G to jump to a line, but accidentally hit g, then try to undo it with u out of habit, before hitting G again, you do the same thing.

Uh to be perfectly honest for the past … 30 years I’ve ran with a buddies vimrc and really never took the time to understand it; it was perfectly good lol and to this day I could not recreate it if I lost it.

> lowercase a whole buffer,

Happens a lot to me actually!

That and accidentally incrementing a numeric value haha..