I recently received the phone call from someone claiming to be from the IRS and they were going to come arrest me unless I went to Walgreen's and bought a gift card and read them the number.
I kept them on the phone wasting their time (and mine) because they called at a good time. I finally told them they are not getting a dime and that they better sent a large swat team because I was ready to shoot em up!
So far no agents have showed up.