One day, the police found a man dead inside a hut. In his left hand, he's holding a gun. In his right hand, he has a recording. When the recording is played, the police hear the man talking about how horrible life is and how he wants it to end. The recording ends with a gunshot. The police are about to call it a suicide until you point out a very important clue. What is it?
The recording played a gunshot inside it. If the man committed suicide, he wouldn't have been able to stop the recording after he pulled the trigger.