Tom Jones - met him a few years in Dublin after my mate chased him down the street singing 'Sex Bomb'. He stopped and joined in and had a chat. Very surprised with how nice he was.
I used to work at heathrow and was based in a room right at the top of the jetway at one of the gates. i walked in and my boss told me Tom Jones was outside. Being inquisative, i popped my head out of the door and lo and behold there he was.
Someone asked him for an autograph and very cheerily and in a loud booming voice said no problems. I even saw a smile, i thought that was nice as he had just off a transatlantic flight and i know i would've just wanted to get home but for him this was no problem, i respect the guy a lot based on my observations