Jimmy Fallon on Wednesday was curious about the “interesting” way Donald Trump stood during a recent talk with reporters. And he had jokes.

A video shared by Trump communications adviser Margo Martin showed the president looking as if his legs were about to cave in.

“WTF Is Going on With Trump’s Knees Here?” The New Republic asked.

Fallon also wanted to know.

Showing a photo of Trump in his curious stance, Fallon said, “How do you do that?”

Fallon continued, “It’s like a Jerry Lewis B-side,” impersonating the late comic’s uncoordinated physical humor.

The host zinged again, saying:

“It looks like one of those toy giraffes that collapses when you press the bottom of it.”

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