Mr. Jerome contends that only he knows the tell-tale sign distinguishing the real McCoy from the impostors who occasionally turn up.

WSJ: A Midnight Dreary for Those Who Seek Tell-Tale Signs of Poe's Elusive 'Toaster'

Dr Venter's was the real McCoy: when he put the viral DNA into host cells they started to spit out new viruses just as self-destructively as cells infected with the natural Phi-X174.

ECONOMIST: Artificial lifeforms

Second Avenue Kosher Deli -- The real McCoy: plentiful portions.

FORBES: Fact and Comment

What you see above is just a miniature, but Spymaster is taking orders for the real, full-size McCoy.

ENGADGET