You died and are now a ghost. How do you prank the living?

I’d haunt a data center and randomly flip bits unless they do some kind of weird ceremony at shift changes
- Having them praise the Omnissiah to appease the machine spirit sounds like a great idea.

I'm the one who's been talking to your cats and other pets when they get that thousand yard stare at that one spot on the wall.

I'd go to billionaires and politicians, and give them panic dreams about burning in hell, haunt them during the day,band convince them that there is indeed an afterlife, and they are going to be tortured for eternity if they do not work to fundamentally restructure society to the benefit of the worker.
I'd also convince them that they have to publicly execute certain individuals

If I was a ghost I would try help them as much as I can, not prank them. Idk what influence I'd have, maybe I can appear in influential people's dreams and influence them to do better.

I'd cook people flavorful meals, packaged up and ready to grab in the morning. Maybe they'd come home to a dinner spread after a rough day. And then I would infiltrate banking systems and regularly but stochastically credit poor people's accounts with amounts below the revenue departments structuring threshold.
Finally, I'd find people with test anxiety and coach them through the problems.
- You're the best kind of spirit.

Slightly move things in people's house. Like every day your kitchen table is in a slightly different position, not different enough to realize what's going on, just different enough to be slightly confused
- Homes with children will never even notice.
- I’d re-arrange the order of the forks, knives and spoons in the cutlery draw.
  
  Does that mean they'll be separated now? Oooh thank you thank you thank you!

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

I'd start appearing at various churches dressed as Jesus talking about "Wait till my father gets done with his latest project and has time to deal with y'all again" to see how many of them say "You mean it's actually real?"

Turn the digital clocks upside down. Did this accidentally to myself once and when I saw it at night I thought for a moment the universe had disintegrated. Startled pretty bad.
Also: mosquito sounds.

Go into their computer
Cause glitches and errors that just arbitrarily disappear or change whenever the user tries to troubleshoot. Which follow no pattern to speak of.
- If you want to practice for your ghastly career you can start by Cenafying your loved ones!

Screw all of humanity. Fake nuclear bomb/missile launches on radar in order to jumpstart the next age of humanity.
I won't be alive to deal with the consequences if someone does accidentally end up firing nukes because of my ghost, so why not make humanity suffer for my amusement?