I've blogged about South African police before (here and here). Overall, I am highly impressed with them; I find them professional and courteous and, considering the pretty high crime rate and the risks they may face, amazingly friendly and civilised.
I have now become a fan of the Namibian police too. We were driving without a front licence plate because it looked like it could fall off at any moment. The traffic police stopped us and informed us that we should "make a plan" to fit it back on, or else "the traffic police will stop you".
The immediate response is, of course, "but you are..." before you trail off and thank the officer very much for their help and drive away.