LOL!
This is true.
It is a celebration of the desecration and vandalisation of a troll's final resting post, and the sharpening of fangs and claw for the next troll.
"It is a celebration of the desecration and vandalisation of a troll's final resting post, and the sharpening of fangs and claw for the next troll."
It's also a warning to future trolls--kinda like when Beorn stuck the Great Goblin's head on the fence. . .