Marek: It was early Friday morning back in the dim and distant 2010 when a phone call walk me up. "You've got to substitute a class at 9.30am, Marek." What, how, why? I didn't manage to form any of those questions. My brain was still working in slow motion. I never taught on Fridays. It was my day off. So Thursdays Was typically a late one. But my boss wasn't exactly asking, so I had to somehow drag myself out of bed and to the class in 30 minutes. Turns out Siobhan, an Irish colleague of mine, had broken her rib, but waited until the very last minute to tell anyone about it. Thanks very much for destroying my day off, Siobhan. No, actually, thank you very much for breaking your rib. Margarita: