In Love Actually, my VERY favorite scene was when Hugh Grant and his driver when looking from house to house for the girl he fell in love with. They get to one house and the little girls ask them to sing a Christmas carole.
Hugh Grant starts off, with Good King Wencseles, and he's a bit rough. Then his driver joins in with the most amazing tenor. Hugh Grant just turns around and gives him this look.
That LOOK!! I laugh so hard every time I see it - and I'll rewind it and watch it like five times before going on with the movie LOL!