Caller ID says SECURITY and they have a message that says the FBI reports a break in every 10 seconds. They are selling a security system or want to come and case your home before they burglarize it!
I like to get these types of calls; I explain that I am on the Do Not Call list (which is useless), but the only calls I take on my cell phone are sex chat calls and then I ask the lady to describe her nipples to me, or if it's a guy, I ask him to describe how he likes to take it in the butt....calls usually stop....