Perhaps by far the most useful creation of the this time period, the “WTF” stamp allows you to rate the level of WTF’ness with ease. You can choose between “!” or “?!” or “?!” — or a combination of the three. They currently are priced at $10 a piece and can be purchased at Knock Knock with free shipping if you spend $50 or more with any given order…so purchase some for your friends, acquaintances (yuck), and enemies. Or just for yourself

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