Automatic Beer Mats

A beer mat that calls for a refill when the pint is almost empty has been invented by scientists in Germany.
The electronic beer mat was created by computer scientists Andreas Butz of the University of Munich and Michael Schmitz of Saarland University.
Beneath the cardboard surface is a small, flat baseplate which conceals pressure and acceleration sensors that react to the weight of the glass and the position and movement of the coasters.
The microsensors then pass on this information via radio link to the bar, where the signal is picked up and decoded by a waiting computer.
The customer can speed the order up by "flapping" the beer mat, and can order more
Must have been made specially for Papa Lou