Escape from the Toilet of Despair

Permanently Closed - You are a 5th grade student at an elementary school. One fateful day during class, you experience a sharp pain in your stomach. It was just a while more until break time, but unable to hold it in any longer... "T-Teacher... May I go to the restroom?" Through the embarrassment, I mustered the courage to say. All eyes turned to me, and it felt like the entire class was laughing at me through their eyes. I might be overthinking, but it's better than leaking in the classroom! It was that moment when another hand shot into the air. "Teacher, may I go too?" It was the plain kid at the window seat. The kid who is barely noticed in class... Or that might actually be me. Was he having a stomach ache too? "At this time?! Fine, go quickly both of you. And make sure you're back before the school bell goes off!" I stood up and walked out of the classroom as calmly as I could. "Let's hurry. The class will make fun of us if we're not back before the school bell!" "W-Which toilet is the closest?" "The one at the back of the staff room! We can sneak in at this time" "But isn't that one off limits?" "....It's fine! Let's go!" Neither of us knew that this would lead us to the start of an unfortunate event. That those toilets had such an outrageous trick to them.....!