Taking place Monday, the quick thinking game had the actress and late night host jumping to hit a buzzer on time in order to give the best possible answer to a variety of questions in classic Family Feud style.
Danes eagerly yelled out "dude!" when the duo was asked to "name something you call someone when you can't remember their name," despite Fallon hitting the buzzer first. The mistake caused the Homeland star to utter out the F-bomb before quickly apologizing and proclaiming "Fudge, fudge!"
Fallon was brought to his knees in shock and laughter later on in the game after Danes answered "homework" when asked to "name something you bring back from spring break. "That's the worst spring break ever!" Fallon yelled jokingly.
"Fast Family Feud" came to a head after Danes responded with "shoot" after being asked "What's a clean word you can say instead of a curse word?" Her earlier response of "fudge" in reference to her previous slip-up was ranked third for best possible answer.