It isn't too often that you see your bartender read your mind, knowing exactly when you need another drink when you've downed your pint. This little invention helps provide the bartender with a visual cue, blinking crazily whenever your drink is nearly empty, signaling a refill. While this is one gadget that Designated Drivers should never, ever carry (much less use), it is definitely a fast track method to hit Drunksville. The auto sensing coaster is powered by a custom ...