Guys like Eddie do exist
I see a lot of people posting that characters like Eddie are too over the top and do not exist in real life.
I've met guys like this, guys that never shut up and seem to have a screw loose. I wouldn't hang around with them, because I find guys like that annoying and frustrating, however they are out there.
Dewayne Johnson seems completely out of place and miscast, and there are several poorly written scenes, however there are definately guys this stupid out there. There are criminals as stupid as all of these guys out there.