One played nervouse, twitchy psychopaths, the other played nervous, twitchy comic foils.
Suppose their career paths had been different, and Don Knotts got the role of Norman Bates while Tony became Barney Fife. What sort of wacky hijinks would ensue?
Now Barney, you know you have to leave your 10-inch butcher knife in the sheath, in your pocket.
What other actors who played mirror image characters would you like to see switch roles?