Controversial talk show host Bill O'Reilly was on 'Letterman' last night, and as usual it wasn't exactly a smooth appearance.

Letterman wanted a high five from O'Reilly after the two finally agreed on something, but O'Reilly was hesitant and left Letterman hanging. Naturally, O'Reilly's reticence was met with boos and moans. Never leave a bro hanging in his own house.

Did O'Reilly finally give in and give Letterman the high-five? Find out in the video below.

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