Another one: James May, anyone? He gave me a dirty look in the street outside a TV studio once. I wasn't trying to speak to him, or do anything in particular.
The same thing happened to me once while walking down a street in Archway, north London. BBC London News presenter Mike Ramsden was walking in the other direction and gave me the biggest dirty look as we passed each other... the strange thing is it took me five minutes to even think who he was!!!