Don’t do anything hokey.
Know the school, what it offers and what you offer them. In other words, know your match, not just your own desires. That’s not always, “You have X major,” when lots of schools do. Nor other generic answers.
But not all colleges specifically ask “Why Us?” Some couch it in other sorts of questions and many will look at how you fill in the rest of the application and supp. If they like and look for X and Y attributes, but you present yourself as Z, oops.