Lily has the zoomies today, and is acting out the condition with Beatrice,
the only other cat in the zoomy mood right now. First time I've seen this
pair being playmates. Yesterday it was Baby Eyes and Abelard for the first
time, and they kept it up for a very long time.

What inspires a cat to suddenly decide after living together for years and
never playing together that a certain other cat should be their playmate?