Hard situation puzzles

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 woman starves to death despite being surrounded by food.

A woman misread something and never saw another person again.

The woman is speaking something and she is upset. Nobody can understand her but a man is filming her on camera. Why? And what is happening?

A man designed a device into which you can insert colored paper, and then get the ideal 100$. Experts can not distinguish them from the real ones. How does he do that, and why does he sell this device?

A man woke up at night feeling thirsty. Then he turned off the light everywhere and went to bed again. In the morning he woke up, looked out of the window and yelled. Soon after he committed suicide.

A woman asks questions to her friend - a policeman - about a strange death. After 5 minutes the policeman is surprised to see that the woman finds out the cause of the death.

Eva was a skeptic, and never believed in the paranormal. But after she had spent 3 nights in a creepy forest all alone, her skepticism disappeared. Why?

He wasn’t hungry, but food saved his life.

A professor didn’t want to accept a student’s paper. Student: “Do you know who I am?” Professor: “I neither know nor care. And don’t try to frighten me!” But the professor still accepted the paper. Why?

Bill always wore a silk scarf to work, whatever the weather. What’s his job, and why does he need this scarf?

Gordon came to see Harry and gave him a few strikes in the stomach. Then, they had a short talk, and he struck a few more times. Harry died a couple of days later. What happened?