Whittling (or should that be whiddling?) urinal cakes in the toilets at work.

Like, you wee on them, and you can literally see them diminishing in front of your eyes. And depending on where you wee, you can shape them. There was one last week that I managed to get into the shape of an upside down pig.

And it is rather satisfying seeing what was a substantial cake on the Monday being reduced to mere slip by the Wednesday or Thursday.

I mean, you have to keep yourself amused somehow, don't you?