Rarity, as a shopper, Pinkie as a Party-goer, and Twilight as a tradition upholder, wake up their friends between 4:00 and 5:00 in the morning to start Black Friday, and take all of their drowsy friends shopping. What Shenigans do you suppose would happen as a result? And yes, I'm writing a fic about this.

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Twilight losing her cool again and being unorganize.
Pinkie Parting too hard that she get kick out.
And Rarity fighting another mare over a dress on sale.

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Twilight being separated from the group. After a long and ultimately fruitless endeavor, the group meet back up with Twilight only to learn that she managed to get everything she needed with perfect effiency. Wither Twilight or Pinkie pie should do this.

Twilight has on OCD freak out because not everything goes exactly according to plan, Pinkie Pie gets thrown out for going into stalker mode by trying to be everyponies "friend" and Rarity ends up beating the hell out of everypony that gets in her way from getting the best deal.