Watch David Letterman and Billy Eichner Have a Delightful Time Screaming at Each Other

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The secret of Billy Eichner's success is not complicated: He yells at people until they like it. On Thursday night, David Letterman was on the receiving end of Eichner's mile-a-minute screaming when the pair played "Celebrity Child or Kentucky Derby Winner?" (It's harder than it seems.). Letterman could not have been more delighted. Look at him smile!