it was the 2nd period of the day at school towards the end of P.E. class, and me and my friend were sitting in the bleachers gym, talking about old childhood memories. I had just found an old TV show that I had been trying to find for a long time because they also knew the show and showed it to me . so the way we were seated was 2 rows away from the last row against the wall on the ground below the seat . any ways we where talking and all the sudden I here an noise coming from under the bleachers. it sounded like the sounds a horror movie spider would make when scampering. my friend said it sounded like a plastic bag covered in a blanket. I stand up and point out the noise to my friend. but when I stood up I was able to feel it too. it felt like something was on all fours moving really fast across the top of the seats. we called out thinking it could have been someone getting a ball , but even if you where tall enough to reach the roof of the bleachers , the mechanism inside would have made it impossible for you to stand up fully and touch the ceiling with your hands. we asked a couple of the other kids if they had heard or seen or felt any thing and they said no. I haven't tried to explore deeper but if someone has a similar problem , hopefully they'll feel less alone