urx unit loader Robert De Niro loses battle with revolving door on 'Jimmy Fallon'   Watch

Robert De Niro: Oscar-winning actor, director, the “Raging Bull” and … revolving door novice?

Making a surprise appearance on “Late Night with Jimmy Fallon” on Thursday (Dec. 12), the estimable performer let the world in on his secret struggle. The man doesn’t understand how a revolving door works. Like, at all.

One man can’t do it all, it would seem.

Check out the hysterical video above.