It's the last day of assassins school, and the final three students are sitting in a room, waiting for the last test. The first one, a man, is asked to take a gun, shoot the person in the next room who has commited treason, then go to the room after, not telling them the gun is filled with blanks. He does so, but comes out in the next room over balling his eyes out.
"Sir, I can't do it sir, it's my wife, I can't shoot her, I love her!"
So he fails.
The next one, another man, takes a gun and goes through, only to appear on the other side crying as well, not having shot his wife. He fails as well.
The last student is a woman. She takes her gun and goes through, and for a few minutes there isn't a sound and her instructors figure she's failed as well. Then suddenly someone screams and shot after shot rings out, followed by a long series of thumps and crashes. The woman comes out on the other side, finally, spattered in blood and gore.
"What happened?!" Ask her instructors.
"Well, some idiot filled that gun with blanks, so I had to beat my husband to death with the chair."