Explaining Biology on Instagram: "A simple yawn — something we all do without thinking — turned into a shocking medical moment. 😨 In rare cases, opening the mouth too wide can cause the jaw joint (TMJ) to slip out of place, leading to a locked jaw that won’t close on its own. That’s exactly what happened here. What started as a normal reflex suddenly became painful, frightening, and required medical attention. This incident is a reminder that even everyday actions can sometimes have unexpected