Doris wasn't thinking clearly. This decision she made was an emotional one.

McGarrett

Sara's going to be gone by the time we get back. It's just as well. It would be too hard to handle watching her leave.

Chin

McGarrett: I got no zip ties.
Doris: Seriously, you didn't bring restraints? And you've been on how many ops now?
McGarrett: You know, Mom, I thought I was coming to get you then getting out. I didn't think I was going to be tying up bad guys.
Doris: Who raised you?

Being a spy wasn't the only thing you were good at, Mom.

McGarrett [to Doris]

Max: Everybody on the island knows of the well-documented paranormal incident.
McGarrett: Everybody except for Detective Williams.

Whatever it is that she saw, it literally scared her to death.

Max

Don't do the crime if you can't do the time.

Danny [to Grace]

Can you help me? I seem to have lost my head.

Jerry

Eric: Not really, [Danny] just psychologically scarred me for life.
McGarrett: He has that effect on some people.

Chin: I just dumped Marjorie's phone. Over the past couple of weeks, she made over 40 calls to the same number.
Danny: Ghostbusters?

Jerry: You know why I love Halloween so much?
Grace: The chocolate? Just a guess.

These psychos had a thing for making their own horror movies every Halloween.

Grover

Hawaii Five-0 Quotes

Why don't they call it what it is? It's spring break for cops.

Grover [to McGarrett]

Kono: Ooo...That guy's pretty hot.
McGarrett: The dark one, right?
Kono: Nah, the blonde.
Danno & McGarrett: That's me.