The button is already glowing. The elevator is already coming. And yet your finger jabs it a second time, because some part of you doesn't quite believe the first press registered. That tiny act of doubt is QA in miniature — you're testing whether the system actually heard you, and whether pressing twice makes things worse. Good software answers both: it confirms it got your input, and it doesn't double-charge you for tapping twice. When the feedback is missing, everyone presses again — and a system that can't survive the second press is a bug waiting to happen.

A user taps "Submit Payment." Nothing visibly happens for two seconds, so they tap it again. Do they get charged once or twice? That's the test I care about most on any checkout — not the happy path, but the impatient one. Disable the button on first press, show a spinner, make the second tap a no-op. The elevator already trained everyone to press twice; the job is to make sure the second press is harmless.

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Until next time,
Tina
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