Bipolar Cookie Monster

I go into this fast food restaurant and order my meal and they also serve cookies there. So I tell the girl I would also like two cookies. And she says we have two kinds chocolate chip and m&m which one would you like? And I say I would like one of each. Then she says, "One of each!? But which one are you going to eat first?" Whoa! A plethora of thoughts just enter my mind at that moment.

What does she mean, which one do I eat first? Is this a test? Is she testing me? Is there a wrong choice? Maybe she's a psych major. Maybe my answer could be a big part of a thesis she is writing. Maybe she's one of "them", a watcher from outer space observing us and evaluating our decision-making abilities. Maybe she's Confucius reincarnated. WHY ASK SUCH A QUESTION!?

So I tell her, "I'm going to put them together and eat them at the same time like a giant cookie suicide.". And then she says, "Oh, I see. Have a good day.". And then just walks off around the back. WHAT THE F*** IS THAT SUPPOSED TO MEAN!