Quint is a central character - a salty old shark-hunter, captain and master of the good ship Orca.
Beyond that, no explanation can suffice - it is like parachuting: if you ain't done it, an explanation can't convey it; if you have done it, no explanation is needed.
You forgot to mention the tune.
She won't know how to sing it.
Let me tell you about sharks...
Oh deary me, oh deary me... *pout*