Three men reach the final round of tests to join the SAS, and are called together to speak with the interviewer. 

"Do you love your wife?" says the officer. 
"Sir, yes I do, sir," say the recruits in unison. 
"And do you love your country?" 
"Sir, yes sir," say the men. 
"But what do you love more, your wife or your country?" 
The recruits do not hesitate: "Sir, my country, sir."'The interviewer stares at them: "We want you to prove this. Your wives are sitting in separate rooms nearby - take this gun and go and kill your loved one." 
The first man gulps and stares at the gun for a few minutes. 
"I can't do it," he says, and leaves. 
"Turning white, the second man goes into the room and all is silent for about five minutes. Soon the door opens and the man, sweathy, with his tie loosened, puts down the unfired gun and leaves. 
The final interviewee looks long and hard at the revolver, then slowly paces into the adjoining room. After a brief silence, the interviewer hears the sound of a gunshot.
There's a brief pause, then an almighty crashing sound and a woman's scream. 
Grinning and breathless, the final recruit emerges from the room and puts the gun on the table. The interviewer looks up at him and says, "What the hell happened?" 
"The gun you gave me was filled with blanks," says the man, breathing heavily, "So I had to beat her to death with the chair."