"Overboard: The Rolling Hitch has been promoted as the only knot to tie in the following unlikely but critical circumstance: while sailing alone you fall overboard and catch hold of the line which you have prudently left trailing astern and find yourself hanging on with difficulty. Before you tire, you manage to bring the bitter end of the rope around your back. You then have to tie a suitable knot to make a loop around you. A bowline cannot be tied under load. Two half hitches will slide and constrict you. The Rolling Hitch is the answer. Even as the second turn is tucked "up" into the correct place, the major strain is taken and the final half hitch can be tied with less urgency. "

Perhaps this should be renamed the "self-trolling" knot.