Yes, I have.
It's one of the dumber scams out there--making terroristic threats and confessing to conspiracy to commit murder in one easy step. When the cops catch up with the sender, it's going to result in a lengthy timeout in a PMITA prison.
Also, the sender never quite knows who the recipient is . . . or how they might react.
I'd simply send an answer back that asks, "How much are you willing to pay to keep ME from killing YOU?"
