Feed Me, Seymour

Oh, I don't know:

If you have a really hard time seeing your beer mug through the fog to determine when it’s almost empty, the Never Empty Beer Mug has a sensor that tells you it’s time for more. “Your beer is running dangerously low,” cries the mug. Obeying the mug, you fill it up, take a few gulps and minutes later it’s telling you, “Refill immediately—danger of sobering up.” You’ll never forget to refill that schooner again. It’s available now for $21.

Trust me: I never have a problem determining when it's time for a refill.