On the morning of our second day, we were strolling down the Champs-Elysees when a bird shit on his head. 'Did you know a bird's shit on your head?' I asked a block or two later. Instinctively Katz put a hand to his head, looked at it in horror - he was always something of a sissy where excrement was concerned; I once saw him running through Greenwood Park in Des Moines like the figure in Edvard Munch's 'The Scream' just because he had inadvertently probed some dog shit with the tip of his finger - and with only a mumbled 'Wait here' walked with ramrod stiffness in the direction of our hotel. When he reappeared twenty minutes later he smelled overpoweringly of Brut aftershave and his hair was plastered down like a third-rate Spanish gigolo's, but he appeared to have regained his composure. 'I'm ready now,' he announced. Almost immediately another bird shit on his head. Only this time it really shit. I don't want to get too graphic, in case you're snacking or anything, but if you can imagine a pot of yoghurt upended onto his scalp, I think you'll get the picture. 'Gosh, Steve, that was one sick bird,' I observed helpfully. Katz was literally speechless. Without a word he turned and walked stiffly back to the hotel, ignoring the turning heads of passers-by. He was gone for nearly an hour. When at last he returned, he was wearing a windcheater with the hood up. 'Just don't say a word,' he warned me and strode past. He never really warmed to Paris after that.