给我3个有趣的单词定义，并用它们造句。
1. Flummox - to confuse or perplex someone greatly
Sentence: The complex instructions had completely flummoxed the hapless DIY enthusiast.

2. Serendipity - the occurrence and development of events by chance in a happy or beneficial way
Sentence: It was only through serendipity that Fred came across the rare coin that he had been searching for years.

3. Kerfuffle - a commotion or fuss, especially one caused by conflicting views
Sentence: The meeting descended into a kerfuffle when the two colleagues started arguing over the best way to proceed with the project.