My grandpa (he was 10 when he was liberated from the Nazis by the US and remaining French troops) told me that a French general would always crack his wrists wh

My grandpa (he was 10 when he was liberated from the Nazis by the US and remaining French troops) told me that a French general would always crack his wrists when someone didn't hurry up. Sometimes with drastic consequences. That is my memory of his story about it, whenever I hear that..