Was in the ER today and a 2 year old child came in with a pulled elbow. The parents were really stressed about how their kid was crying and wasn't moving their arm for the past several hours. Ortho comes in reduces it in 5 seconds and minutes later the kid is back to normal, playing like nothing ever happened. The look of relief on the parent's faces was priceless.
It got me thinking about what other simple looking maneuvers seem like sorcery to people outside of medicine. Another one that comes to mind is Epley's maneuver for BPPV. Patient is dizzy, throwing up and can't even turn their head. And without any tests, medication or equipment you can cure them completely.
What else fits this description?