David Letterman looked back on his 38 years of friendship with Robin Williams on "The Late Show" Monday night.
They met at the Comedy Store and Letterman was blown away by Williams' talent and humor. In fact, he admitted everyone there was scared of him because he was that good.
From their days at the Comedy Store, to Williams bringing Letterman on "Mork and Mindy" for a guest appearance, they remained dear friends. Williams even appeared on Letterman's show as a guest 50 times.
When Williams came on the show two things happened, "One, I didn't have to do anything. All I had to do was sit here and watch the machine. And two, people would watch if they knew Robin was on the show. People were drawn to him because of this electricity, whatever it was that he radiated that propelled him and powered him."
Letterman put together a touching segment of Williams' appearances. But before he showed the clips, he said, "More than anything it will make you laugh and that's really what you should take away from this, that he can make you laugh under any circumstances."