On paper, a nefarious plot to murder and castrate Justin Bieber sounds terrifying enough. Now the actual audio call between the criminals who planned to do the deed has been released (thanks to TMZ), and hearing the actual discussion is enough to make the baby fine hairs on your neck stand up. It's that chilling.

The two men speak in code and refer to Biebs and his bodyguards as the "pit bulls" they are going to kill and castrate with hedge clippers. Ouch! We can't even...

The men -- Dana Martin, who is in jail serving two life terms for raping and killing a teen, and Tanner Ruane, with whom Martin was conspiring to carry out the deed since he was free and able -- were planning to hit Biebs after he performed at MSG in NYC last fall. Police intercepted them and shut the plot down. Ruane was to team up with his uncle Mark Staake, a former inmate recruited by Martin, to carry out the execution.

Martin is said to be obsessed with The Biebs and talks about how to perform the killing.

He tells Ruane, "Tie it really really tight. Knot it in the front once, really tight, put it in a knot. That cuts off the oxygen, and then tie it in the back again, really tight. That seals the deal."

Martin also tells Ruane, "[Mark's] going to kill the pit bulls and you're going to castrate them."

Yikes. This is scary stuff. Thank God the po-po put a stop to this.