Yeah lol. I guess if you've ripped the IRS off, you're feeling scared and not thinking straight.
The most devious scam along those lines I've heard, is they find a husband and wifes phone number. They call the husband when he's at work and pretend to be the phone carrier: "Hey, this is AT&T, we're calling to let you know we're upgrading your phone speed! blah blah blah. But you will need to turn your phone off for 1 hour, is that ok?"
Then after the husband turns off his phone, they call the wife and tell her they've kidnapped the husband -- and she needs to immediately transfer money or he's going to be killed. Then they send her the transfer details. Obviously the first thing she tries to do is contact her husband, but can't and then makes the transfer.
Truly awful :/
This one's been growing in number big time lately. People will seriously do anything to make a dollar. There was a news report about someone who got a call about her "daughter" that was kidnapped... while they were together. So she brought it to light on social media and other places.