Wow, this movie was the 2nd one that came to mind when I saw this thread! It was just on last weekend, too, so I was able to catch it again. The "prequel" to Silence of the Lambs (one of my top 3 movies), and I may even like it better than Red Dragon, its updated version with Hopkins & Ralph Fiennes.
The movie I 1st thought of for this thread was Sling Blade.
I saw bits and pieces of Slingblade...Came out at a time when life was busy. I like Billy Bob Thornton a lot and I am glad you brought that up...might be time to slow down and watch it....