Everyone sits in a circle and one person is elected to be the doctor. He is given a stocking which has a jumper stuffed inside it, which is known as the 'bonker'. The madrich then shouts out the name of a chanich who has a certain disease which is cured by the doctor 'bonking' them by hitting them on the head with the boker. To prevent yourself from being bonked you must shout out "Dont bonk me, bonk *other chanich's name*" The new chanich now has the disease and the doctor must try and bonk them. If the doctor successfully bonks someone, then they swap with the bonked chainch.