New situation puzzles

The sound of Brian’s snoring is usually just annoying, but today it causes terror and panic. Why?

Why is it better to have round manhole covers than square ones?

Alexander shot at the king, but no one condemned him. Why?

A young woman has her photo taken with her grandfather, but they have never met before, and neither of them is aware of their relationship.

A woman completes a drawing, and then commits suicide. Why?

Everybody knew that if Julia took one step forward, she would die, but nobody told her.

Gabriela's decision to stop moving saved her life.

A woman hits the windshield of a vehicle travelling down the road and falls to the ground.The driver calls the police. When the officer comes, he looks after the victim and takes her into custody. Why?

Lou is in a cave when, suddenly, he hears a sound from outside. He thinks it's strange, so he goes out to see what had happened, and dies the moment he exits the cave.

Igor breaks into Thomas' home to kill him but he doesn't do it. However he is immediately arrested and sentenced for the crime. Why?

A man goes to the auto repair shop and asks the mechanic when he is available. The mechanic says he is busy for the next 2 hours. The man thanks him but doesn't return. A few days later, he asks him again, the mechanic says he is busy for the next one hour. Again, the man doesn't return. Next day the man asks him again and the mechanic says "You are lucky, 5 minutes and I'm available" but the man leaves anyway.

A man quits his job and celebrates by throwing a party all night. The next day he dresses up and jumps from the balcony of his house. Why?