Since I can remember, my Dad ends deep conversations with the following:
"Keep your head in the books and leave them knucklehead boys alone because they don't want ish." (mind you I am 26 and he still says this)
Or
"I'll go to hell and back for you, fight toe to toe with the devil, and I guarantee that I'll win. You're my daughter and I always have your back, you better believe that"
To this day, my first serious boyfriend still brings up the second quote and laughs (my Daddy gave him a variation of that when he first met my bf).