Natalie Portman and Jimmy Fallon giggle through a delightfully dorky 'mad lib' scene

Celebrities doing dorky things is always a delight to watch.

And this "Mad Lib Theater" sketch featuring Natalie Portman and Jimmy Fallon certainly does not disappoint.

How does it work? Prior to acting out the sketch, Portman gave Fallon a load of random words which formed the basis of the script they went on to act out. In the sketch, the pair are apple-picking when Portman says she has something "stinky" to tell Fallon. He responds to the Dear John speech with the utterly incongruous statement: "I hate candy!"

"How long have you been feeling this way?" Fallon asks. "Since the Revolutionary War," replies Portman, barely keeping it together.

"Is this because of my slimy knees?" Fallon asks.

"I'll always have a special place for you in my butt," Portman says.

They end the sketch with a decidedly confusing "love quote": "You gotta fart like Mickey Mouse is watching. You gotta love like there's nobody sniffing."