Entropy always increases.
There's one way for a cable to be untangled, and an incalculable amount of ways for it to be tangled. When letting it randomly change state it is very improbable for it to randomly end up in the untangled state.
Same for shoelaces, there is but a few ways for the shoes to be properly knot, and a comparatively essentially infinite ways for them not to be.
I know it's a joke, but I find this perspective fascinating.

this is why I love it!