Moonjacking?
Stealing an entire moon?
That’s pretty serious.
Three ways I know it can be done:
Wormhole the moon into a processing plant.
Drop a fleet of strip mining harvesters on it.
And blow it up. Collect the pieces.
All three will screw up the planet that the moon orbited.
Usually happens to uninhabited worlds.
No witnesses.
But sometimes, if a moon has valuable enough resources, you’ll hear a distress call.
Galactic Mining Enterprises has a whole planet full of lawyers for when that happens.
Well, had.
Celestial Industries blew up its moon.
And the meteor swarms decimated the planet.