I have tied it in side knot which has a 1970s look to it. (jacquardflower.uk)
If thermal fluctuations pull to the correct side the knot disappears, while if they pull to the loop side, a proper knot may be created. (sciencedaily.com)
I added a little side knot — you know, to keep the whole 90's vibe going. (mykindofsweet.com)