Jiggle bones

Jiggle bones are a feature of the Source Engine that allow a model skeleton to bounce or wiggle realistically with the object it is attached to. The effect is calculated and rendered in real time, giving a more realistic depiction of the way the part would move. Jiggle bones are used frequently on several items in Team Fortress 2 to add to their appearance.

Objects that use jiggle bones

The Hustler's Hallmark's jiggle bones.

Class	Type	Object	Location of jiggle bones
Scout	Weapons	Mad Milk	The milk inside the bottle.
Scout	Weapons	Holy Mackerel	The fish.
Soldier	Weapons	Black Box	The flap on the back.
Soldier	Weapons	Buff Banner	The flag.
Pyro	Hats	Handyman's Handle	The wooden handle.
		Napper's Respite	The tip of the hat.
		Respectless Rubber Glove	The glove's fingers.
		Triboniophorus Tyrannus	The entire creature.
	Misc.	Stockbroker's Scarf	The tie.
20px Demoman	Hats	Hustler's Hallmark	The feather.
20px Demoman	Hats	Sober Stuntman	The straps.
Heavy	Hats	Coupe D'isaster	The toupee.
Heavy	Hats	Pugilist's Protector	The straps.
Medic	Weapons	Vita-Saw	The liquid in the container.
Sniper	Hats	Larrikin Robin	The feather.	Weapons Sniper	Weapons	Darwin's Danger Shield	The crocodile's tail.
All classes	Hats	A Rather Festive Tree	The tree.
		Alien Swarm Parasite	The tail.
		Max's Severed Head	The ears.
		Treasure Hat	The chest's lid.
	Misc.	Companion Cube Pin	The cube.
	Misc.	Earbuds	The cords.
NPC	N/A	Horseless Headless Horsemann	The Horsemann's cape.