The following words / phrases have been used to the point of inducing instant nausea in admissions officers. Avoid leading off with these types of sentences at all costs!
As a global nomad, I have learned from every place where I have lived.
Being a third culture kid has brought mixed blessings.
I have a deep passion for...("deep passion" is trite)
I find xxxxxx endlessly fascinating... ("endlessly fascinating" is overused)
My name is (don't start with that!)
Don't lead off with a quote by someone- you could use that at a later point but not as your first sentence!