Backwards clocks are a reminder to stop assuming that there is a “normal” orientation for things. Even if there such a thing, it is a poor reason to insist on conformity. A huge dose of craziness is what makes life interesting.
You can order one through Amazon, among other places.
Please keep an eye on your friends or family if they are drinking while looking at these clocks. They’ve been known to cause brain freeze and bewilderment.