Girls star Lena Dunham appeared on The Tonight Show armed with the funniest flashback story. She and Jimmy Fallon [1] recalled the last time they had seen each other, which was at Howard Stern's 60th birthday party. Lena told the host that Howard had called her a "fat Jonah Hill-looking girl." Instead of backing down, Lena then came back with an equally hilarious sting, and after hearing her one-liner, Jimmy started to laugh uncontrollably. Watch the hilarious scene go down in the video above, and then see Lena own Jimmy in Pictionary [2].