I think I'm having trouble reading this sign. Does it really say "this sign will be covered in silly string from 12:00 a.m. October 31 to 12:00 Noon November 1?" I think it does! [This Isn't Happiness via Boing Boing]
I was going to call shenanigans on this based on two things. One: it's outright ridiculous and two: that plastic sign looks to be a little too temporary.
But after a little research it appears it may be true. [www.google.com] (Search the PDF for "56.02").