I have always known that a slip knot has power. Assymetric puissance. For she who holds the cord controls the knot. When making a plan that has considerable risk, it is not unwise to enable a slip knot within for bargaining power later on and for timing purposes.
When has this been used? When hasn't it?
Who and when will the (truth?) story come out about (insert your fave conspiracy theory here!) ?
Climategate? Sure! Lots of knots there and most have a slip element!