8. Don’t Mess With Texas

It started as an anti-littering campaign and became a rallying cry for an entire state. It was more than catchy. The first year, litter was down 29% — the largest reduction ever measured in America. Within 10 years, litter was down 72%. And in 2006, it was voted America’s favorite advertising slogan. Writers take note: Four words can make all the difference.

Don’t Mess With Texas Poster