I have resigned myself to never having a good one. You see I work on a military base. MPs have an operation philosophy wherein it is as good to show that you are working as it is to actually catch criminals. Because of this MPs will pull you over for doing 1 mph over the speed limit just to let you off with a verbal warning. This isn't to penalize you, it is so they can flash their lights and demonstrate to all your co-workers driving by that the MPs are on the job. Look civilians, this could be you next so slow down!
Such was my lot this morning. What was really hilarous is that the biggest leadfoot I work with was right behind me and waved as he passed by.