The 42nd Street block between 4th and 5th is doing its best to keep trash where it belongs. That's the block with the new-ish condo building (you know, the ones that caused 43rd Street backyards to sink during its construction?).
Well, the block has several signs in Spanish and English adorning trees (must you staple into them?) that politely request that you keep your trash in the containers meant for trash. They even remind you that there are trash receptacles on every street corner!
Personally, I think the owner of the pooch below gets the point across much more succinctly. It's also on 42nd Street.