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A Klein Loop is a scenario in which a team that demonstrates consistent, sustained postseason performance is nevertheless trapped in a loop of postseason doom, heartbreak, high-stakes defeat, and humiliation at the hands of the same few rivals. It is a Sisyphean condition that alludes to the impossible folds of the Klein bottle. A team trapped in a Klein Loop must have a "nexus" - a specific rivalry with a team or teams that form the twist in the Klein Loop.

Notable examples include:

• San Francisco Boat Shoes in the Klein Cup. Nexus: Milwaukee Flamingos (Milwaukee Ice), Alewife Arsonists (the Alewife Firewall), Sugar Grove Eavesdroppers (the Static Stranglehold).