How to write a turning story from comedy to tragedy with the word 100?

A colleague liked cats very much when he first got a cat. He usually buys what cats like to eat. Whenever he cooks fish soup at home, he will feed his favorite cat with a small spoon. But every time he feeds the cat soup, the cat struggles to resist strongly. So he concluded that cats prefer fish to soup. Later, he stopped feeding the cat soup.

But one day, a colleague accidentally knocked over the fish soup and spilled it all over the floor. The cat ran over and licked it. Colleagues suddenly realized that cats like soup, but they just don't like being forced to feed them. Many times, because the method is wrong, I have done bad things with good intentions; What was originally a comedy turned out to be a tragedy; You could have done something successful, but you failed in the end.