CollisionDetection

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Shout your message while listening. If what you hear isn't what you shouted, someone else must have been shouting at the same time, so you'll need to shout again. Oh, you'd better wait a random amount of time first, 'cos the other person is doing the same and you don't both want to keep shouting at the same time.

Who bumped into me yesterday outside Tesco's?

: Elementary, my dear Watson. Yes, I _know_ that Sherlock never said that.

CategoryComputing