Seeing as this is Lesson #15...you're going to go back in time and remember one of your craziest moments as a fifteen year old.
Step back in time, back into your teenage mind.
Write about what you thought about that night when you crawled into bed after that day.
What were you thinking? What were you feeling? 
Did you get caught?
Did anyone lose any brain cells?
Was any property damaged?
Did you have fun?
Have you ever told your Mom about this?