Girl logic on hair products

Girl logic (noun): def. the science of the formal principles of reasoning, which only make sense to the female gender or persuasion.

I had an interesting discussion earlier this week and I realized it was the perfect example of girl logic. Words are not verbatim (obviously I didn't have a courtroom typist with me), but very close to the truth:

Scene: cubicles at [insert big company here]
Time: Thursday afternoon before a Friday night "big date"

Me: Moonie's free tonight. Wanna go for a cupcake or some Jacques Torres?

Nikki: Ooh, sure. I'm meeting some friends tonight, but I have some time beforehand.

(pause)

Oh crap, I forgot that I really, really need to get more of that stuff for my hair. I have my date tomorrow night with D. and I want my hair to be touchably good.

Me: Maybe you can get it before we meet Moonie. Where can you buy it?

Nikki: Umm, only at this one salon on 57th between 5th and 6th.

Me: That's impossible, you must be wrong. You're telling me that you can only get this particular product at one salon in this city? What is this stuff anyway?

Nikki: Ouidad. It's the best product I've ever used to keep my curls intact.

Me: Wait a sec. You bought some stuff for your curls last week at Duane Reade.

Nikki: Yeah, but that was just interim stuff.

Me: Oh, ok.

Nikki: I know what I'll do. I'll just go to Duane Reade and get interim stuff and then get the Ouidad next week.

Me: But, you already have interim stuff.

Nikki: Yes, but it's interim interim stuff. It made my hair a little icky, so I need to get the interim stuff.

Me: Of course.

Now, a boy may scratch his head and ask, why didn't you just buy the interim stuff instead of the interim interim stuff while at Duane Reade last week? In fact, why buy the interim stuff at all? Why not just go to the salon and save money buy buying the correct item the first time around?

A girl would never question this, thus making this the perfect example of Girl Logic.