When the user treats your email confirmation field like it's asking them to write their life story instead of just re-typing their email. "Yes that Is my Email" – buddy, I asked you to confirm it, not give me a verbal affirmation like we're in couples therapy.
This is what happens when people don't read instructions and just fill in whatever feels right in the moment. The validation regex is probably having an aneurysm right now. Meanwhile, the poor developer who thought a simple "Confirm Email" field would be foolproof is somewhere questioning their entire career.
Pro tip: This is exactly why you need client-side validation that actually checks if the two fields match. Though honestly, even with the best validation in the world, users will find creative ways to break your forms. It's the circle of life in web development.
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