" I’m working on several theories,” I said. “But I’m currently favoring the hypothesis that the moon has a seemingly arbitrary effect on magic because it likes to piss me off.” “That’s a theory with a high degree of applicability to other spheres of life,” he said. “Yes it is,” I said, and we spontaneously fist "

― Ben Aaronovitch , Foxglove Summer (Rivers of London, #5)