Notice of notice

So I noticed this notice on a recent business trip to Florida — apparently it’s now a required feature on vending machines there, but I can’t for the life of me tell what purpose it serves:

Notice of notice

It doesn’t have any inspection certification, or license information, or any obviously useful data like that.  But somehow this thing struck me as being oddly familiar.  Then in Steamboat Springs this past weekend, I noticed a sign from a distance that may have been the source of my dim recollection…

2014.07.04 Steamboat fireworks 023

Coincidence?  I think not!