Good luck getting through this clip of Billy Crystal talking about Robin Williams with Jimmy Fallon on 'The Tonight Show' without getting choked up. You can't do it. You just can't.

On last night's show, Crystal shared some beautiful (and, yes, very funny) memories of his dearest friend with Fallon, and the duo soon started trading favorite stories about the special comedian. It's moving and silly and great, and you're going to need a hankie.

Rest assured, it wasn't all doom and gloom on the show, though, and Crystal and Fallon soon lightened the mood with a little round of 'Lip Flip.' You can start laughing now.