Just met him an hour ago!
I went to a Michael Caine q & a at the toronto film festival, and when they turned to the audience for questions, someone stood up to ask for advice about acting and turns out it was Sam Neill! Michael recognized him immediately. He was very humble and polite and came across exactly as you would expect. Afterwards he was talking to people a bit in the lobby, he seemed very shy, but shook his hand and told him I was a fan of his work.
Michael Caine was everything you'd want him to be, the interviewer didn't even need to ask questions, he had so many amazing stories to tell.