I was offered to do a billboard, after much back and forth I realized the most effective way to get the attention of the passerby was a quote. 

When I was 17 I got arrested for climbing a building and getting on the roof...etc ..etc. When I finally got down the cops said what were you doing up there, smoking weed, graffitiing, vandalizing?  I responded, 

"I climbed the fire escape to see the stars" 

He didn't believe me, but it was true.