I've broken many bones but my left forearm was the worst by far. If it's a compound fracture and your muscles and tendons pull the two ends of the bone down against each other you are in for one hell of a fucking experience. Think of snapping a pencil in half and laying the two pieces side by side on the table.
The only way to set that is to streeeeeeeeetch the limb and snap the bones back together, and I hope you're really, really, REALLY fucking drunk when that occurs. Like alcohol poisoning drunk. Unconscious, almost dead, nerve damaged, unable-to-register-any-sort-of-feeling-whatsoever drunk. Because if you aren't you're gonna want to commit suicide once they get started.
Been there, done that. Telescoping wrist injury from getting thrown into a wall.
Yeah, both the radius and Ulna had fractured and embedded into their other halves.
The rebreak sucked ass.