Missed a call from this number and called back.  Got an accented female who talked to fast when answering for me to catch the company.  She verified my phone number and she knew my name and address.  I asked what company she represented and she said she's with the government and starts in on having an IRS lawsuit against me.  I told her that all communication about a potential lawsuit needs to be done via certified mail.  At this point, she started getting belligerent and saying that I had received certified mail already (Not true) and that I'll be going to jail if I don't cooperate with her.  I simply told her it wasn't true and that I'd be calling the police.  Unfortunately (rather fortunately) since I didn't give her any information, the cops can't do anything to pursue her.  Boo.