Daniel Radcliffe, Rupert Grint, Emma Watson, more on hand for London event
Alan Rickman waves to the crowd (sort of)
Alan Rickman (AKA Professor Snape) walks the "Harry Potter " red carpet
He'll soon be seen in "Gambit," with Cameron Diaz, written by the Coen Brothers.
Here's a new clip showing Rickman at his intimidating best: