Good example of a double slip knot used for shoelaces. It always annoys me to double knot my running shoes (and if I don’t, they will come untied) only to then try and carefully untie the mess 45 minutes later. Hopefully this will keep my shoes on just as securely, while allowing me to take them off without a fierce struggle.
This entry officially allows you to point to this site and shout, “neeeeerd!”
[edit] – This so totally works. Rock!