Mr. Mackey Buys Pants

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Mr. Mackey Buys Pants is an April Fools South Park fangame posing as a fangame called "Trapper Keeper Revolutions" (based on a South Park episode from season 4 called Trapper Keeper) by "Beamer", which has a screamer at the end.

The game opens with a Beamer Games logo, announced in a deliberately silly voice, followed by a menu with "MR MACKEY BUYS PANTS" being repeated and chanted in an equally moronic sounding voice. The menu gives two options, "BUY PANTS", or "DON'T BUY PANTS". The latter does nothing, so upon pressing the former, you are taken to the "first-level", in which silly music is playing, and you control South Park character, Mr. Mackey, as he floats around a world of giant pants/trousers, and you're given no instructions on what you're supposed to do.

After 30 seconds, however, a vibrating closeup of Katie Embry from The Ring pops up with a loud, high-pitched, echoing scream, followed by the game saying "APRIL FOOLS" along with a clown horn, and then the application ends.

The game, as well as all other South Park fangames from spgarchives.com disappeared in 2009/2010, however, they are still available on the Wayback Machine.

Link
NOTE : The following game contains a screamer, mmkay!
 * web.archive.org/web/20070125193809/beamer.spgarchives.com/Games/South_Park/TrapperKeeperRevolutions.zip