My nine year old grandson just told me this joke:  So, three FBI cadets are at their final stage of training for proficiency with firearms, hand to hand combat, and loyalty to the agency.  They are brought into a hallway with three doors. 
The first cadet goes into the first door and comes out and says, I will not shoot my father.  He is immediately dismissed from consideration.   
The second cadet goes into the second door and comes out and says I will not shoot my grandmother.  He is immediately dismissed from consideration. 
The third cadet goes into the third door.  There are five gunshots and a lot of commotion.  The instructors burst into the door and say, What is going on? 
The cadet says, It was my ex-wife and some idiot put blanks in the gun, so I had to beat her to death with the chair
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Hired!