Make sentences with three words: prank, alley and chivalrous man. My cousin will give them to the teacher.

After studying at night, I hurried home, passing a dark and deep alley, and saw a figure flash by. I thought it was another prank. After all, someone did this to me, so I sneaked in and thought I was a knight-errant to expose my bad classmates. I didn't expect to scare him away as soon as I walked by. Later I learned that he was frightened by my sinister expression like Sadako.