Today I had a top tube spot and didn't notice him till I left the train at Richmond to discover he was in the same carriage as me, also getting out at Richmond. It was the actor John Hannah, he out of Four Weddings and a Funeral, who also played Scottish detective Inspector Rebus on TV, BUT most notably and relevantly starred in the top tube film Sliding Doors with Gwyneth Paltrow. To see a guy on a train who is possibly most famous for being in a film about travelling on the tube was really, really freaky.
The other thing that tends to freak me out about seeing actors in the flesh is how short a lot of them are. I got the impression that Gwyneth Paltrow was quite tall, so assumed John Hannah was too, as she didn't seem to tower over him in the film, but he's quite short for a bloke, I'm not sure if he's even six foot.
Not seen on the tube but walked past Paul McGann (who played the most recent Doctor Who and was I in the cult film Withnail and I) today in Poland Street who I had a major crush on in my youth. He was singing to himself walking down the street which I thought was quite sweet.