David letterman/harmony korine?

Letterman says " do you know ruby wax?"
Harmony says " I never met him"
Everyone laughs
Paul salutes
...I don't get it... This is in the 1997 interview it's on YouTube. Also letterman said he lifted the ban does anyone know when korine will be on the show again?
Update: I kindof got that.. I just don't get the salute... Was korine being sarcastic because he said I never met "him"
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