It's been over a week since the stunning news of Robin Williams' death. 

With conversations about Williams still happening in offices and homes and on social media, you realize how much he was a part of everyone's life in some small way.

His influence is especially so in the world of comedy and stand-up.  And Dave Letterman paid tribute on his "The Late Show with David Letterman" last night. By the end of the montage, it's easy to choke up a bit.