"It's alright for some!"
said the Library Assistants, so we promised to pick up some rock for them. A couple of blocks back from the library we were visiting we spotted a rock shop and popped in. Amidst all the usual suspects -- giant humbugs; rock dummies; and those big red lollies with the cat's face on them -- they had some rock willies. Exactly the thing!
Actually, to call them rock willies is to understate the intimidating dimensions of the things. I spent a few moments looking for toes, or at least fingers. Anyway, we bought them to take back to the library. Only after we had parted with our money did we spot that purchases were placed into clear polythene carrier bags.
Still, we got a bit of space on the train back home.