The recurring Mad Lib Theater segment has previously featured the likes of Kevin Spacey, Chris Pratt and Benedict Cumberbatch. For the first half of the skit, which can quickly get repetitive, Fallon prompts his partner for a series of words. "Type of profession?" "Cruise director." "Type of relative?" "Second cousin." This continues for roughly three minutes.
In the second part of the segment, Fallon and his guest bring the silly stream of unrelated words to life. On Wednesday, Fallon played Mr. Gooby Gock; Wiig was Dr. Mackerel. "Our X-Rays found a canoe in your Achilles Heel," she told Fallon. "It also appears you have a rare condition known as fluffy platypus disease."
Neither performer was able to keep a straight face as they reeled off these screwy lines, which is part of the fun. Wiig ended the scene with a flourish by singing a song called "Feel My Face" that she invented in real time: "You and me gotta get out of this place/ And come back to the apartment so you can feel my face."
Wiig visited The Tonight Show to discuss her role as a voice actor in Despicable Me 3, which is out on Friday. Pharrell, who wrote several songs for the film's soundtrack, also stopped by The Tonight Show earlier this week.