Some good advice in this thread. I live near MD and DC, and that proximity is why I never leave a gun in my truck/car -- what if I forget and wander over there? The crime rates there are much higher, anyway.
I have an example of egregious gun laws that top anything in this thread, although the story may be apocrophal. In DC, empty shells are considered ammunition, and you cannot have ammunition unless you have a gun permit for a gun in the same caliber. Gun permits are virtually impossible to obtain unless you are a politician.
Warning: D.C. cops under orders to arrest tourists with empty bullet casings
So here's the egregious case: a man had a cigarette lighter made out of an old rifle casing. His wife, during the course of their divorce, found out about the DC law and called the police to his house -- and he was arrested for having illegal ammunition because he did not have a gun permit.
True story? I don't know. It could be.