Virtually anything is billboard-worthy: Stewie Griffin for President, Legalize Weed, Happy Birthday Elvis, Music Feeds The Soul, Glenn Beck Sucks… Seriously, anything goes.
I wonder what would happen if we funded a billboard that read, “Smile.” Would it cause some people to smile as they passed it? And would those smiles be contagious to others they interacted with. Could we get an entire city smiling? I think we can.