I love this. Unfortunately, a square mug like this can't be easy to drink from.
Originally shared by +ThinkGeek:
Your beverage may or may not be radioactive – you won't know until you drink it. Schrodinger's Cat Mug: http://j.mp/1Ms7MfG
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Today's Most Clever (If Impractical) Mug Award goes to
Just sip from the corner.
It would be easier to to so if it were in a "diamond" than a square — i.e., the handle in a corner, not a face.