Haunt your crewmates when you die. If you speak loudly enough while spectating, the person you are watching will hear a spooky ghost noise, and so will anyone else spectating.
Note that for the mod to work, both the haunter (spectator) and hauntee (person being spectated) must have the mod installed.
Watch the trailer:
The following values are configurable in Thunderstore / the BepInEx config file:
Thanks to my go-to Lethal crew. Special thanks to Luke, Nick and especially Jonathan.