Why the cable in the drawer tied itself in a knot

What follows is an argument about spontaneous cable knotting, and about where the received version of it stops being true.

This has actually been studied

Physicists have tumbled lengths of string in boxes and counted the resulting knots, which is a real experiment with published results. The finding is that knots form readily and quickly, and that the probability rises steeply with length before levelling off. Below a certain length, knots essentially do not form, which matches the everyday observation that short cables stay tidy.

Greater stiffness reduces knotting substantially, which is why a thick power cable behaves better than thin earphone wire. The mechanism is that a free end braids itself through adjacent coils during agitation, one crossing at a time.

Confinement helps rather than hurts

Tighter confinement reduces knotting, because the strand cannot form the loose loops that a free end needs to pass through. That is counterintuitive, since a cramped bag feels like the cause, and the experiment found the opposite relationship.

Somewhere in the release notes, it explains why a cable in a small pouch survives a journey and the same cable loose in a rucksack does not. Agitation is the other necessary ingredient, which is why the drawer you open twice a day is worse than the box in the loft. Removing either agitation or free length prevents the process, and the second is far easier to control.

The free end is the culprit

Knots require an end to pass through a loop, so securing the ends removes the mechanism entirely regardless of how the cable is stored. A hook-and-loop tie, a twist tie or the cable's own moulded strap achieves this in about two seconds.

Three clicks later, folding a cable in half and securing the middle produces a bundle with the ends together, which is even more resistant. This is why cables sold with an integrated strap arrive untangled and stay that way while the strap survives. Losing the strap is the actual beginning of the problem in most households.

Coiling correctly is a real technique

A cable coiled repeatedly in the same direction accumulates twist along its length, which stores energy and makes it spring into loops. The over-under technique, which alternates the direction of each loop, cancels that twist and produces a coil that lies flat and pays out cleanly. It is standard practice in audio, film and stage work, where cable handling is a professional skill rather than a preference.

The technique takes about ten minutes to learn and permanently changes how cables behave for the rest of your life.

It also extends cable life, because accumulated twist stresses the conductors near the connectors where they usually fail.

Why cables fail where they do

Almost all cable failures occur within a few centimetres of a connector, because that is where bending stress concentrates. Strain relief moulding is designed to spread that stress and is frequently the first thing to crack on a cheap cable.

Wrapping a cable tightly around a device, particularly a power adapter, concentrates exactly the stress the strain relief exists to prevent. Coiling loosely and never pulling by the cable addresses the two causes of most failures. That is why the expensive cable and the cheap cable often fail in the same place at different speeds.

If a charge looks wrong, the boring route — written complaint, then the ombudsman or regulator — still works better than a review.

A storage system that works

Secure both ends of every cable with a tie, which is the single change that eliminates most tangling. Use small pouches or dividers rather than one large bag, since tighter confinement genuinely reduces knot formation.

Three clicks later, learn the over-under coil for anything longer than a couple of metres, particularly extension leads and audio cables. Never wrap a cable tightly around the device it powers, and never pull a plug out by the wire. And accept that one cable in the drawer will still be knotted, because the physics gives probabilities rather than promises.

The takeaway

Tie both ends, store it tight, and learn to coil over-under.

It is not you being fussy. It is genuinely badly made.