Oh… It Fell
Test tubes don’t stand on their own, and it’s easy to come to this conclusion with one quick glance. That’s why test tube holders exist. For some reason, this teacher decided test tubes can stand on their own. Maybe she misjudged the shape or thought her test tubes were different. After filling the test tubes with acid, one of them fell over, and unsurprisingly so. All she did was look at it and say, “oh… it fell.” To be fair, there’s nothing else you could say in that situation (Buzzfeed).