Rarity tends to embrace innovation: after all, a pony who wishes to stay on trend must move with the times. And she loves anything which gets rid of dirt. So when she sees a new kind of shower at an expo, she becomes the budding company's first customer. Because what could be more important than cleanliness?

The common sense required not to be a new product's tester. That's much more important.

(A stand-alone, no-prior-reading-necessary part of the Triptych Continuum, which has its own TVTropes page and FIMFiction group: new members and trope edits are welcome.)

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