Albert Dieudonne and Napoleon's ghost.
"I flung open the door. I was in uniform and I said, "Asleep on duty, Matat?" The poor fellow woke up completely bewildered, rubbed his eyes and stared at me. Then I went. Next day, he told the curator D'Esparbes about it. He confessed that in the past he'd been joking a little but this time he'd really seen Napoleon. Unfortunately, the poor soul died eight days later and I may have been one of the causes."