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That's a horrible UI. I just tried it...since when does a mouse over indicate an "action"?

Oh well, I like Stripe so it's not entirely wasted.

Not everything has to be an overthought, standard UI element. It adds a bit of Fun, and is harmless in its consequences.

It would be nice to be able to undo though.

This is the worst kind of UI element of all. It's both overthought and not standard.

It's different. I don't understand how it's fun or useful.

Different strokes for different folks, I guess.