Write about something you frequently forget

I am driving faster than the speed limit. Mainly because I only have a half hour to get an hour's worth of shopping done.
There's an empty parking stall in the front row, and I snatch it before anyone else can. Smiling to myself, I turn the engine off and collect my things.
Where's my shopping list?
I check the space between my phone and wallet. Nothing. What about the center console? Not there either. I rummage around the truck cab, not finding the slip of paper that has the whole reason I rushed here on it. Did I really leave the list sitting on the kitchen counter at home? Impossible. I remember grabbing it. So where did it go?
I remember a few of the items, the most important ones. But there are others that I need, that I've already forgotten.
Should I try to find some paper and re list the items? Or should I run back home?
I glance at the clock and cringe. Down to twenty five minutes. No time to go home. A makeshift list it is.
There's some note cards in the center storage compartment. I dig them out, then try to find a pen. After digging deeper, I come up with a broken pencil. That won't work. Dropping the pencil back into the bin, I take a deep breath.
Pen. I need a pen.
My wallet. It always has a pen in it, ready to write checks. Thank heavens for that wallet.
My handwriting looks worse than a first graders, but I think I got everything recorded. Wracking my brain one last time, I put the pen down and fold the paper into my jacket pocket.
Recollecting my keys, wallet, and cell phone, I check the clock again. Twenty minutes.
I start toward the store at a quick pace, hoping I can make up some time.
The carts are pushed together in neat rows, and I grab one, heading toward the produce section.
I place my wallet and cell phone in the empty cart, then notice my list is missing yet again. Where did that go? A hurried check of my pants pocket, then a thorough pat down doesn't turn up anything.
Sighing, I figure it's probably no use to go shopping anyway, especially without a list and limited time. But something spurs me to go forward, to just finish the task I set out to do.
The shopping is fast. And I feel like I've gotten several things that weren't on my list, and forgotten the ones that were.
By the time I get to the checkout, my head is hurting and I'm ready for a nap.
The cashier takes the items and scans them with methodical passes. I remind myself to be patient. It's not their fault I'm running late. By the time I pay and get my receipt, I feel like I've aged a year and lost.
As I near the truck, I reach into my jacket pocket where I safely placed my truck keys. Paper rubs against my fingers. I pull the paper out and read it.
There's my shopping list!