Such notices would be much more effective with a suitable example of things not to do. The following video would be an excellent teaching aid. Warning, it's a little NSFW because, well, kids are kind of stupid.
Found at Hot Air.
We'll be going down to the beach tonight to observe the highly illegal and completely independent fireworks display put on spontaneously by some of the more adventurous denizens of the beaches. Hopefully, nothing like the above will happen. Pictures later, I hope.