These posters have been all over the New York City subways and buses for quite a while now, in both English and Spanish (Si ve algo, dice algo).

But soon, if the application goes through, the Metropolitan Transit Authority will have a trademark in the phrase. The MTA is pretty aggressive on intellectual property, especially considering that they are a municipal organization. I can't help but wonder if trademark attorneys' fees aren't 50 cents of every $2 fare.