<human>: Can you summarize the given text in a few sentences?

Yes this happened today, unlike many posts here. I was walking with my sister and her friends around my old elementary/middle school. On the outside of the school, there are almost no windows and in the place of them are giant letters of the alphabet that can be climbed. My sister dared me to try and climb as high as I could. I got to the second row and mis-step and fell off and landed on the cement seat below in front of my sister, her friends and some people walking up the street. I scraped my arm but it doesnt hurt (also almost the entire place is made of bricks).
<bot>: Sister dared me to climb giant letters on the outside of a school and fell on concrete. I'll probably post a picture later of what I fell off.