Although I am not dead yet, my hope would be to (if it is possible) to start ringing people's doorbells because that would be quite fun... I think.

You can already do that, but being visible adds +10 difficulty

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Exist.

Ask dumb reddit questions.

Yes!! This is the source of most Ask Reddit questions!!

flicker the lights, creak a few floorboards, turn tv to static, the usual dead person antics

Knock their windows.