Neil Patrick Harris stopped by Letterman on Wednesday night to discuss -- among other things -- his adorable toddlers attempting to play the slots in Vegas.
But in addition to his interview segment, Harris was part of a rare Letterman cold open, wherein the actor paid the host a sincere compliment before the show in the green room.
Clearly, Letterman just isn't great at taking compliments.
More:David Letterman Neil Patrick Harris The Late Show With Stephen Colbert Late Show With David Letterman
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