[on Grinder's appearance, an undercover ATF agent who documented his time with the Hell's Angels in the book "No Angel"] The pictures of this guy were just this thick necked linebacker looking [guy], covered in tattoos," Manganiello said. "He looked like the scariest guy on the planet and not like a cop. So I always thought that. One of the things that really struck me about 'Training Day' is you see Denzel walk out with his bling and get in his low rider and you think he looks like a gangster, and that's the point. Undercovers, they look like the guys they're chasing after. So I always kept that in the back of my mind and then when I got cast in the role, I started thinking about that neck down tattooed look.