Falling Snow From Roof
by Chris MacDonald
This one really is like poetry.
“Falling Snow From Roof” sounds like a fragment of a normative haiku of the 5-7-5 (syllables) kind. A very Canadian haiku, that is.
I mean, it has to be poetry, since the more natural bit of prose would reverse the words “falling” and “snow.” “Caution: Snow Falling From Roof.” Or maybe it needs punctuation. “Falling snow! [From where?] From roof!”
Normative Signs: The Poetry of "Ought" 
Note also that this is a sign that applies only part of the year, yet is visible year-round. A sign should be especially important to get into that category.