Caller said he was from the IRS.  " I better watch out or else"

Saying this is the IRS and they need me or my attorney call this number for a very sensitive problem!

I just got it also.  Scam

I received the same call. The tone was flippant, but threatening  - not like you would expect the irs to be. I am very tempted to call them back - even though it is obviously a scam - to find out more.

Do you know if it is possible for them to somehow charge my phone if I call them  back?

Seems like all three of us received that phone call within an hour, I am 99% positive it is a scam.