I’m going into every single office building I can find and just hitting “Ctrl+z” randomly on peoples keyboards as I float around.

Maybe the occasional screen rotate. Most offices workers would not know how to fix their screen being upside down or sideways.

For the bosses I would change the keyboard over to dvorak layout or something.

CEOs I would probably alter their email signature slightly in an offensive way so they get in trouble and possibly fired.

I can think of so many wonderful things to do as a ghost lol