The director of the CIA has to test three new agents, a 25-year-old, a
35-year-old, and a 45-year-old.
 
He puts each of their wives in a different room.  He hands the
25-year-old a gun and says, "Go into the room and kill your wife." The
25-year-old says, "I can't do it. I love her too much."
 
The director hands the gun to the 35-year-old and says, "Go into the
room and kill your wife." The 35-year-old goes into the room, comes out
after five minutes, and says, "I can't do it."
 
The director hands the gun to the 45-year-old and says, "Go into the
room and kill your wife." The 45-year-old goes into the room. Three
shots ring out, and then there's the sound of scuffling and fighting.
The director runs into the room and sees the wife dead on the floor.
He says, "What happened?" The 45-year-old says, "Some asshole put
blanks in the gun, so I had to choke her to death."