At the hospital on the battlefield
A severely wounded General was carried in. The doctor immediately started operate on the general in attempt to save his life.
During the surgery, the nurse had an uncanny face and acted odd. All of a sudden, the nurse took out a knife and stabbed the doctor. While crying, the nurse said, “I’m sorry doctor! You’ve always treated me well. But I’m actually a spy and I cannot let you save this man!”
While holding on to his wound, the doctor replied, “wtf, why didn’t you just stab the General instead?!”