British funnyman Ricky Gervais terrified a group of London students when he pursued them after being blasted by a water bomb. THE OFFICE star was jogging in the British capital when the pranksters from the University of Central London threw a water-inflated balloon at him, drenching the comedian. But the joke was short-lived after Gervais promptly sped up the path to their campus door. He says, "I went to check it wasn't some old woman emptying her chamber pot but all I found were some spotty students. "I gave them a ticking off as a joke but they looked terrified so I felt guilty afterwards."