So many people wondering about Tom Hanks - I've never met him, although I would love to, but I have met his wife. She is very nice.
I've met loads of famous people through my job, and the majority of people are fine, maybe not gushingly lovely, but polite and absolutely normal.
I've not personally met James Cordon, but colleagues have, and their experiences weren't good at all.
One person who does stick in my mind for being an absolute sweetie is Renee Zellwegger