Envious Ounce

Next time you're out drinking with friends, you can amaze and delight them when you down a shot of rum (arr!) and then tap your shot glass on the table — and watch it illuminate with a bright red glow! The Envious Ounce has a red LED and a battery in the base, which lights up for a few seconds when tapped. The battery will last for thousands of illuminations, so you can amaze people over and over until they're sick of you! $9.99 USD or $7.99 USD if you buy four or more. (Via Gizmodo.)