"Law & Order" has been on a comedian kick of late featuring Michael Showalter, Jim Gaffigan and Rob Corddry as antagonists in this, their 20th season. With all this inspiration we took a look back at those that came before so you could judge the creepiest of them all.
Of course, there have been others who are not on our list: Janeane Garofalo played a movie exec early on in the series, A.D. Miles (Fallon's head writer) played a tech nerd on "Criminal Intent," etc. But we were looking for the comics who played bad guys and played them so well that we got chills. Who made you want to sleep with the lights on?