When Norm met "The Funniest Man in the World." (Via Getty Images)

News of Robin Williams' death Monday has caused so many people to reflect on the contributions he made as an actor and comedian, sharing their favorite movie and standup clips. 

Early Tuesday morning, comedian Norm MacDonald went on Twitter and shared the first time he met Robin Williams. He was scheduled to make his first appearance on Letterman when he noticed "The Funniest Man In The World" walking around back stage. Williams popped into MacDonald's dressing room and pretended to be a a Jewish tailor, then fluidly became a man taking a Chinese takeout order while on the phone with MacDonald's friend. MacDonald recalls Williams being funnier than anything he had planned to do while on TV.