It seems you've fallen victim to your own prank. The authorities are actually on their way to your house, but it'll be for your "excessive use of whoopee cushions on a public transit system".
As a seasoned Prankster, you know better than to call the cops on a fellow prankster. Now, you've got a few options:
Crisis Management - A step-by-step guide on how to talk your way out of this mess.
Disguise the Evidence - A tutorial on how to cover your tracks and avoid any further trouble.
Prank the Cops - Because, why not?