A man was going up to bed, when his wife told him that he'd left the light on in the garden shed, which she could see from the bedroom window. He opened the back door to go turn off the light, but saw that there were people in the shed stealing things.
He phoned the police, who asked "Is someone in your house?"
He said "No," but some people are breaking into my garden shed and stealing from me."
Then the police dispatcher said "All patrols are busy. You should lock your doors and an officer will be along when one is available".
He hung up the phone and counted to 30. Then he phoned the police again. "Hello, I just called you a few seconds ago because there were people stealing things from my shed. Well, you don't have to worry about them now because I just shot them."
Within five minutes, police cars showed up and caught the burglars red-handed.
One of the Policemen said "I thought you said that you'd shot them!"
He replied "I thought you said there was nobody available!
Disclaimer. If you do try this, you can be charged with filing a false report. Also, armed police arriving at a supposed shooting scene increases risks to all involved. The police do prioritise calls based on degree of danger and the like. Making a false claim could pull police resources from a more important incident, increasing the risk for people there.