Open up notepad, save the blank file as "Prostitution Tycoon" (without the quotes). Go to your folder options and make sure known file extensions are hidden. Now go into Steam and choose Add Game and select the file you just saved. When you open it from Steam, you'll open up the blank notepad and everyone else will see the pop-up notification "Husar is now playing Prostitution Tycoon."
If you don't have file extensions hidden, it will say "Husar is now playing Prostitution Tycoon.txt." instead, which ruins the joke.
:)
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