[tomsthumb]

One going backwards is right four times.

I'm not totally sure this extends your analogy appropriately, but it's an entertaining thought.

[sssilver]

Interesting.

- A broken clock is perfectly right twice a day

- A clock going backwards is perfectly right 4 times a day

- A normal, working clock is probably never perfectly right

[mercer]

In the second case at least four times, no?