The snake knot is mostly decorative, not ideal for situations requiring a really strong knot. You can use it to make keychains and do all sorts of other things. In this video the folks at ITS Tactical teach you how to tie a snake knot quickly and easily.
ITS Tactical, Inc. is dedicated to showcasing the everyday gear and DIY projects that can help you live better on the tactical side of life. They don't limit their content to any particular viewpoint, rather their goal is to become an open-source collection of different methods, ideas and knowledge that could one day save your life. Search ITS Tactical on WonderHowTo for more videos.