He'd say things like, "Why dontcha sit on mah face now baby? Uh-uh-huh!" in a voice that sounded very much like the real Elvis. Whoever got the call would instantly mute him, announcing, "I'VE GOT ELVIS!"
The rest of the girls would run back to the reservations office and listen in while the agent put him on speakerphone. He'd stay on the line until he realized there were a gaggle of girls laughing at him. He called without fail on every full moon.
Found on customers_suck Read the comments for the lycanthroperv remark.