Knurdling is a hallway game invented by Manchester fandom in the mid 1960s. The object of game is to place an empty soda or beer can as far from your feet as possible, without touching the floor with anything except your feet. It is a somewhat physical exercise and being tall and having upper body strength is the key to success. The game was played at British Eastercons in the 1960s, and at Loncon II, the 1965 Worldcon.