Disk of Returning
Once upon a time there was a place in Runescape called the Black Hole. Banned Players were sent here as punishment.
The Dwarf that looked after the Black Hole was named Thordur, he would give you the chance to have ‘The Black Hole Experience’. During this Experience, Thordur would sell you a Disk of Returning for ten Gold Pieces, prior banishing you into the Hole.
You had to Spin the Disk to get out again. But somehow Lower-Level Players were getting inside without the Disk, and High-Level ‘kind’ Players would sell the Disk to the Low-Level Players for 100-400 Gold Pieces. They removed the Entrance to the Black Hole, but not the Black Hole itself!
This means the Black Hole still exists, but the Entrance and Thordur were removed. The Players with the Disks became ridiculously rich, as there was a mad rush to buy them. This Item has been nicknamed ‘The Donut of Returning’ since Runescape 2, because it looks like a Donut.