Powerful words

I was taking a trip to Jacksonville with my dad, mom's parents, and my sister. We drove there and were there just a short while when my grandparents announced that we'd be leaving. I was upset, and, as we were driving back out of the city, I started yelling about how I wasn't ready to leave. I hadn't seen or done everything I had wanted. We were approaching the city limits when I spotted a large blue banner with white lettering. It read: DON'T LEAVE UNTIL YOU'VE GOT WHAT YOU CAME FOR. I immediately got out of the car and enjoyed the city with my friends.