This was a very good episode based on an event that happened in my home state of Kentucky. In the real-life case in KY the victim ended up suing McDonald's for millions of dollars and the manager and perpetrator did go to prison.
Robin Williams was very creepy, just like in the movies Insomnia and One Hour Photo. At first I didn't realize he was doing the voices to confirm his fishing alibi. If that was him doing the waitresses voice, it was pretty good. But when he did the motel clerk's voice, I could tell it was Robin Williams and realized he was tricking the detectives. I've heard of those "shock" experiments. You can read about more experiments like that in the Malcolm Gladwell book "The Tipping Point." I think I like Robin Williams better playing creepy than over the top funny. Sometimes he gets on my nerves when he is doing comedy. And I will probably start watching SVU more now that Jesse L. Martin has left the original L&O.
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