On December 21st, 2004, Jagex introduced Santa to RuneScape in Varrock, Falador, Ardougne, Catherby and Yanille for roughly two weeks. Upon speaking to him, he will offer you a Christmas present, a yo-yo! If you obtained a yo-yo, you will be able to pull off some unique stunts with it.
Play - The most basic yo-yo move.
Walk - From the famous "walking the dog" move.
Loop - Loop the yo-yo around your wrist and back into your hand.
Crazy - Combo of Walk and Loop moves while quickly tilting your head.
Like Rubber chickens, you will not be able to get a yo-yo if you have not gotten one in 2004, but if you lose yours, the toy merchant Diango in Draynor Village will gladly give you a new one.