There's one! Not exactly happened at school but I was in my school age. My cousin and I went to a stationary store in town using a bike. I stood on the foot pedals attached to the rear tyres all the way forth and back. On our way home, she cracked jokes that made me stand uncomfortably on the pedals for laughing too much. Then the moment of embarrassment came where we laughed too hard that we peed our pants! We can no longer hold it in. We laughed even harder after it happened hahaha. Fortunately, we safely arrived home with good hilarious memory in mind 🤣