Got left a message on voice mail, a computer generated voice, saying the call was to notify me that the IRS is filing a law suit against me. To get more information on the "case file" I am supposed to call (253) 655-4857.
Had a similar call this morning here in the UK, which isn't the first time but is the first where the number wasn't blocked. Like SAndrews comment below I also try keeping them on the phone as long as possible, if convenient for me, wasting their time and money. I managed 12 minutes today, getting on with other things while I pretended to be booting up my computer then taking ages to find the buttons he asked me to press. When I told him twice that I couldn't see anything on the screen there was a pause, then a sigh before he said "You're not doing anything are you?". When I said "No", he huffed before saying "Oh f*** off!" and hung up. With the call originating from outside of the UK we can't block or report it as such and so if I can keep them on the line then hopefully it may at least save someone vulnerable being scammed.