Some advisors recommend “hooks” as creative options but don’t really make much of a case for using them.
I don't think the purpose of a "hook" was made very clear in this article. If there are 80,000 applicants to UCLA, and you want to be considered, you must find a way to stand out from the other 79,999. How do you do that? Take a good look at what you have to offer— how would you sum up the most significant quality you possess? Perhaps, you are very determined. How can you show that quality manifesting in your every day life? Find a way to make that quality, with your example, be very appealing, convincing and extremely important, in fact, focus your essay on this quality. Use that example as the narrative which leads the reader to your outstanding quality. That's the way to approach a "hook"!