I stood in the kitchen with a blue pen in my hand, looking at it blankly and thinking, "Now, what was it I was going to write down?"

TWO MINUTES EARLIER:

I need to schedule an oil change. I know they're going to ask me the mileage on my car, and I'm the kind of apathetic person who knows it's time to get an oil change but can't remember the mileage. So in order to make the trip to the car to check the mileage worthwhile, I should take the car and go to the grocery store. And if I'm going to the grocery store, I should take the opportunity to post my car payment (since it's almost impossible to mail something from where I live). In order to post my car payment, I need to write out the check. And writing out the check requires a pen, which is in the kitchen.

I am in the kitchen because I need a pen to write the check to make the car payment which...which...wait, I'm in the kitchen because...okay, give me a minute. (Hey, there are mint Oreos! I forgot I had those!)

ETA: All that, and they never asked me the mileage anyway. ::facepalm::