How does Paul McCartney think up this joke so quickly?!

Question: How does Paul McCartney think up this joke so quickly!?

At 3:30 in this video "Idom, idiom, idiot" is he just genuinely that sharp!?Www@Enter-QA@Com

Answers:

He's worth a few hundred million so he's sharp enoughWww@Enter-QA@Com

Isn't he the walrus!?Www@Enter-QA@Com

u make no senceWww@Enter-QA@Com

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