Surgeon's knot

One of the best practical bits of wisdom I've gleaned from the internet is how to tie my shoes securely. Three years ago I discovered the surgeon's knot - the most common of all the secure shoelace knots - at Ian's exemplary Ian's Shoelace Site.  I know that many surgeons now favor clogs and crocs, but that's their business; I've been using the knot for three years, and not once have my laces come untied!