Years ago a local cop gave me what I believe is the golden rule for policing: "We don't catch 'em because they're smart!"
The few times I have witnessed direct police action I usually heard the phrases, "You can't arrest me!", "I know my rights!", "I never touched her!", etc.
I also watched two cops NOT arrest a very drunk guy because he called a friend to come pick him up. He was trying to eat an ice cream cone but kept tilting it over and tilting himself in the other direction while on a public sidewalk. Guess they were not bored enough to process him that night. When they asked where he was from he kept saying, "I'm not from around here so I really don't know how to get there."
Lots of police actions are kinda funny, except the ones that turn violent or get really crazy.