Most Martial Artists learn to attack the Elbow with traditional weapons such as a Hammer Fist (Tettui), or a Middle Block (Chudan Uke) type of an action. This is typically stated to "Break" the elbow, which is incorrect terminology. The real occurrence would be a dislocation, not to be picky, however to realize that we must use correct terms, structures and methods that are real... we owe this to the founders of each style.
Now this unfortunately is a ill advised action in today's society as it physically damages the recipient. But there is a way to use basically the same action, and cause altered states of consciousness, without the damage. This can only be accomplished by using or properly targeting the elbows underlying weaker structures (Kyusho) along with the correct trajectory that accesses and triggers these weaker structures.
To learn the method, targets and see the affect in real time, the extended films are located at these links: