I work on a military base with tight security and it is very common to have your car inspected at checkpoints. They do the usual searches and "look" under the car with a mirror. I usaully chat about VWs while they are doing this. Today the guard asks me in a concerned voice what the canister is with wires coming from it on the right mid-portion of my car.
I ask him to describe the "wires" and he tells me the colors...blue, white, and black and the white is coming from a canister. I calmly tell him that it is my fuel filter and those are fuel shipping hoses. He then grumbles and says he has never seen hoses and canisters under a car like that before.
Know thy car fellow owners becasue you never know when it will come in handy (and save you money).
Come to find out he used to have a 72 bug and we talked VW engines for about 5 minutes.