You know immediately what movie your wish is from. "Genie," you say, "I wish there was a colony of werewolves living in the park, werewolves like in 'The Howling'."
The genie claps his hands three times, and points to the north side of the park (which is much larger than you realized). "You'll find them over there," he says, "I hope you know what you're getting yourself into."
"Oh, I do," you respond, as the genie turns into a cloud of smoke and dissipates.