You leave the house forgetting you have a kid's band-aid visibly taped to your chest.
The cashier accidentally charges you twice what your groceries actually cost and you unblinkingly hand the money over.
You pour formula powder into a bottle that already contains mixed formula.
You answer the phone by saying "hi, I was just calling to let you know...".
You drive home with your coffee cup on the roof of the car.
You turn up for your doctor's appointment a whole hour early and then stand gawking at the receptionist as if she's mad.
You try to eat a ball of cotton wool thinking it's a marshmallow. *
*I didn't actually do this, but it wouldn't be totally out of place right now. Four months and counting. Sigh.