/sci/ - Science & Math

This isn't a iq test or anything, I'm just curious on what maths or science caused this to happen; while I was spinning my keys around my finger, two of my key rings (one large (ring two) and one small (ring three)) on my main key ring (the same size as the larger key ring (ring one)) became interlocked with one another, when before the two (ring two and ring three) were not. How did this happen? I'm preplexed and thought to give /sci/ a go at it.