We won't...

...take this as a warning, signs are everywhere,
daring you to do things, or, saying don't you dare;
we could live without them, they're not of much use,
and some of them have meanings that are obtuse.

This one has a meaning, but, it's a little over done,
I wouldn't dare with this one, the owner has a gun!
My guess is..hmmm. a hermit or a recluse of some kind,
but it's really possible, it's an NRA guy that has lost his mind.

This one refers to Hogwarts, a place that don't exist,
I might not ought to say that, someone could get pi__ed;
it's the home of Harry Potter, the little wizard guy,
and judging from the 'mailmen' it's in the sky.

This one appears to be funny, but doesn't do the job,
it's a sign of no smoking, or a note to a slob;
and who would care if cockroaches got cancer anyway,
we all want them to die, so if it's by cigarette, I, for one, won't cry.

Enjoy!