Mostly Ironic

"Those who are born immortal instinctively know how to cope with it, but Wowbagger was not one of them. Indeed he had come to hate them, the load of serene bastards. He had had his immortality inadvertently thrust upon him by an unfortunate accident with an irrational particle accelerator, a liquid lunch and a pair of rubber bands. The precise details of the accident are not important because no one has ever managed to duplicate the exact circumstances under which it happened, and many people have ended up looking very silly or dead, or both, trying."