Easy situation puzzles

Tim is sailing his boat when his watch falls overboard. He is a great diver. However, he does not manage to retrieve the watch.

A car driver causes an accident when he crashes into a bike, as he was making an unexpected turn at a crossroad. When the policemen arrive, another man gets arrested. The one who was driving is carried home.

A woman - at work - is going downstairs, when suddenly there is a blackout. In that very moment she realizes that her husband is about to die.

A couple find a man's corpse on the beach. The corpse is under an umbrella and has a knife on his back. There are no signs of violence and no traces of blood. The autopsy reveals that the man died of natural causes.

A woman is watching a movie. Suddenly she hears a lot of explosions and people screaming outside. Then there is silence. The woman turns off the TV and goes to sleep.

Michael is in prison. One day, he has luch, goes to prison courtyard for a while and finally visits the library. At dusk, out of the reach of the security cameras, he changes his clothes. He then goes through the door to leave the prison, without being caught.