Step 1: Call the target, but make it sound like a real emergency.
Learn how to fake an emergency in Step 2
Step 3: Use an absurd reason for the call, like "I'm calling to report a squirrel on your front porch!"
Get more examples of ridiculous reasons in Step 3
Step 4: Hang up, and pretend it was just a wrong number.
Find out the art of the perfect hang-up in Step 4
Disclaimer: Do not actually call the cops with these scripts. That's not funny, that's just mean.