Adventures in Prank Calling.

She gets on the other line & calls the police while you stay on the line waiting to call the police.

Margaret: Well, I have just called the cops & this call will be traced. So you better get off of this phone if you have any braincells left.

You: Shut the hell up you old hag.

She hangs up & a few minutes later, the police come & arrest you for harrassment