The Nutczak book of anti-interrogation say to always reply to a question with another question, Just do not lie to them.
You have the right to not answer any questions, so use it to your advantage.
Scenario #1
Nutczak gets stopped by the po-po for some unknown reason, officer friendly asks, "Do you have any weapons in your vehicle?" my response is typically " why do you ask" or something of that nature.
The well used "Where are you coming from/going to" gets a finger pointing and saying "That way, why is that important?"
If you get the demand to step out of the vehicle, make sure all windows and doors are closed, lock the doors, and place the keys in your pocket. This will eliminate what many police are referring to now as "A terry frisk of the vehicle" With neither of you having immediate access to the vehicle, any weapon contained within it is now out of play.
I do not let any officer even reach into my vehicle, I open the window just enough during a stop to hand my DL and paperwork out, that is it.
I got stopped a week ago, I am quite sure that I have been called many colorful names when he was referring to me back at the station later that night. The stop was for "Loud exhaust" he got a surprised look on his face when I asked what the decibel reading was on my truck, and what the law says maximum decibels are. And the last time his decibel meter was calibrated. Surprisingly he stated he did not have a decibel meter, so then I asked what benchmark he used to determine that my exhaust was in fact loud, and compared to what? (I do have this on video)