Another way to be the most efficient alcoholic is ensuring that your glass is never empty, and this invention from students and a professor at the University of Munich can do so. The intelligent coaster includes a gravity and weight sensor. It can be calibrated to an empty glass before any drinking is done. Once an empty glass is placed on the coaster it can then notify the bartender immediately. No idea on how the bartender would be alerted, but I would assume it would be by some kind of computer or pager system.
Coaster wary of empty glasses [Ubergizmo]