South Park: Imaginationland (2008)

The episode begins with Cartman directing the other boys through a forest in search of a leprechaun. A skeptical Kyle is there, having made a bet that if Cartman can prove leprechauns exist, Kyle will suck Cartman’s balls, but if not, Cartman will owe Kyle $10. To Kyle’s shock, they do spot a leprechaun and give chase. They eventually and successfully catch it in a trap. The leprechaun says he was sent to warn of a terrorist attack, and that being chased by the boys has made him late, before vanishing. A triumphant Cartman declares that Kyle must now suck his balls, but Kyle initially refuses, asking why a leprechaun would be warning of a terrorist attack and insisting that there has to be a logical explanation. The next day, as Kyle is conversing with Stan, Kenny, Jimmy and Butters, a strange man suddenly appears, asking them if they have seen the leprechaun.

When Kyle argues that leprechauns are just imaginary, the man tells him that just because something is imaginary doesn’t mean it is not real. He then invites the boys for a ride in his magical “Imagination Flying Machine” while he serenades them with “The Imagination Song” (consisting simply of the word ‘imagination’ sung repetitively in various tonal inflection). The group arrives in a place called Imaginationland, where all the beings created by human imagination reside. The imaginary creatures are all fascinated by the presence of “creators”, and ask them about the leprechaun. At that moment a band of Islamist terrorists suddenly appear and set off a series of bombs, which kill hundreds of the imaginary creatures and destroy most of the city, with Stan watching. The boys flee on the back of Draco who flies them to safety. Butters, however, gets left behind, and he and the surviving imaginary characters are taken hostage by the terrorists.