Experiments on LEP2 at CERN, the world's most powerful electron-positron collider, were recently delayed several days because of a mysterious malfunction. Technicians finally traced the source of the problem: two empty bottles of Heineken beer had been left inside the accelerator's 27-kilometer long, 10-centimeter wide, circular high-vacuum beam pipe. The makers of Heineken have long claimed that their beer "refreshes the parts other beers can't reach." CERN officials were not amused and have requested that Swiss police investigate whether the unwanted intruders were the result of carelessness, sabotage, or a bad joke.