Tangential anecdote: I once entered used-book store looking for and old math book. Noone there except a grumpy looking man with a wild hair and a big beard sit

Tangential anecdote: I once entered used-book store looking for and old math book. Noone there except a grumpy looking man with a wild hair and a big beard sitting at a desk in the far corner. I start browsing the shelves. “WHAT ARE YOU LOOKING FOR?” “Um, eh, Play with Eternity.” “WE DON’T HAVE IT.”