Alice and Bob do event-driven architecture (Bake Off edition)

Disclaimer: I'm the author. This is the first time I've used Alice & Bob outside cryptography: they're together at last, rather than sending messages to each other, and I hope they're happy together in cake-filled bliss.

In all seriousness though: it's hard to come up with names for analogies. It's hard to come with analogies period.

What are the best examples you've seen? And what are the worst?