“D’you speak English?”

I turn around. Before me is a stereotypical American guy, about the same age as my dad, in a baseball cap and an Italian soccer shirt. I’m really very tempted to retort with a gallic shrug and a, “Non, je ne parle pas l’angalais,” but I don’t. I’m very clearly reading an English book and what if we’re stuck in this line for the gallery for ages and I need to ask someone something and have to do it in French?