I'm gonna tell you a funny story, at least it's funny now it wasn't when I was on the side of the road.
One night I was driving home from a friends house and I got pulled over (it was 2am, and around here if you're on the road at 2am and you do ANYTHING wrong and a cop sees you're gonna get pulled over instantly). The cop comes up to my car, asks for license, registration, ect. and then asks "where are you coming from" I told him a friends house and he asked "have you had anything to drink" (now, I had a drink or 2 a few hours earlier, but it was out of my system by then cause we had a couple of drinks with dinner, then played cards and watched movies till 2am, and I'm over 21, so there's no reason for me to lie) and I answed, "yes, I had two drinks around 8 or 9". Then here's were it becomes a problem...He asks "do you know why I pulled you over", my answer word for word, "no, occifer, I don't", this statement is IMMEDIATELY follwed by "please step out of the car" and a fun road sobriety test (which I passed because I wasn't even remotely drunk). In the end, it's just a funny story because nothing happened after I passed the test, I got back into my car and drove home.
But, if I wasn't drunk, why did I say "occifer", because being confronted by a police officer in any situation where you know you might have done something wrong causes a lot of stress (the whole time he was at the window of my car I was freaking out trying to tell myself that I was sure I was sober and that there was no reason to freak out, but because of the stress, I was pretty freaked). Now, being approached by a police officer at an urban set up that you (and he/she) know you should be at will cause stress, and 85% of the time you will screw up and say "occifer" (that's an actual statistic I learned in Drivers Ed, believe it or not), it's something like, you say the thing you keep telling yourself not to say. (for Family Guy watchers - "What's your name?" "Uh, Uh, Pea...Tear...Griffon, yeah Peter Griffin...crap").
Hope that helps clear up my statement and maybe even gives you a laugh at my expense (don't worry, everyone I tell that to laughs). So, whenever confronted by a cop always, always go with "Sir" or "Ma'am", it's much harder to screw up, haha.