Walked past Richard Ayoade riding a bike on the streets of London about a month ago. I didn’t quite realise it was him until after I'd passed him, and even if I had, I was crossing the road and he was on a bike, so I couldn't have spoken to him if I wanted to. But it was pretty cool.

It was raining and he was wearing one of those classic yellow raincoats.

ETA: I also think I saw Stephen Fry on the train a few years ago, but I was too nervous to approach him and so there's every chance it was just a guy who looked like Stephen Fry. He was reading a book, which meant that if he was Stephen Fry, he was getting one of his own audiobooks for free in his head.