This thread reminded me of something hilarious my tabletop group pulled off about a year ago.
During this particular campaign, we ended up going into a Dwarven fortress built into the side of a mountain that was occupied by goblins. One of the major mechanics of the area is that if you spent too long in the area and the goblins were aware that you were somewhere in there, the goblin boss and his lieutenants would prepare to face the party personally. If you long rested, they would be waiting for you, changing the environment to their favor in the meantime.
My party managed to best them, and someone came up with the idea of cutting off the goblin leader's head and carrying it around with us to intimidate all of the other goblins we ran across. It had hilariously predictable effects, all of the goblins fled in terror for the rest of the dungeon. (It didn't work on the Duergar on the next floor though.)
