Well that was easier than expected.

ohdearohdearohdearohdear
... like the game of Mornington Crescent in its purest form, the enjoyment of this particular variant is participatory, anticipatory, circulatory, narratory and any other -atory you may care to throw on the pile.
A race to the finishing line, it most certainly is not!
Patience gentlemen please :-)
[and a little wry subtlety wouldn't go amiss]

I think I'll just observe this one, I'm no good at telling stories. Not to people that aren't the police, anyway.

All right. How about making the final line a bit more convoluted, a bit like the ones in the very early editions of ISIHAC? Anyway, I'm up for another round.