Don't fidget, or act furtive. You don't have to put your hands in sight, just don't be bouncing around. Don't ask what the problem, or my problem is. I will tell you why I stopped you. I will retrive your D/L, look at it and you. I will then explain why I stopped you, it's not a quiz show, so I won't ask why. I will then ask if there is any reason for your doing this. I have received some legitmate answers over the years. Based on attitude, severity of the infraction (and it had better be pretty damn bad for me to stop you in the first place) and any other factors. I will warn you, warn you in writing, or issue a citation. After I issue the citation I stress that here you are allowed to go to drivers school one time a year to keep points off your D/L, and this usually saves on insurance. I even give a short spiel about how to get set up for school.
All I ask is please do not exit the vehicle unless asked. Rudeness will not get you any breaks. Don't be coy, or argue. If you feel you didn't commit the infraction, you have a chance to go to court. Don't yank your fuzz buster off the dash, don't tell me there is no way I clocked you on Radar, because your fuzz buster didn't go off. Basically, don't be stupid or an asshole, or combination of the above. Because after 18 years, I pretty much have seen it all.