Today I did something incredibly dumb. Not costly dumb, not anything with serious consequences, just something really dumb.
I had to drop our car off at the mechanic's at their overnight drop-off place, where you leave the keys after hours so in the morning they can get to work on it right away. So I drive up to the garage and they have a key drop-off slot. I get out of the car and lock the door.
But as soon as I go to drop they keys off, I find they have these envelopes where you have to fill out a form and it says, "You must sign here."
Well, I had nothing to write with; the pens were in the car, and the car was locked, so I walked to the grocery store (nearby, just a couple of blocks away) and I get a pen from a cashier, fill out the form and walk back.
I put the keys in the envelope and put the envelope in the slot, and walk home.
Now I know you see what I missed. I had the keys the whole time! Something about the pending putting-the-keys-in-the-slot made me think I couldn't get back into the car. I had the keys in my pocket the entire time.
I didn't realize my mistake, even after returning to the mechanic's place, putting the keys in the envelope/form and putting the keys in the slot.
I didn't realize my mistake during the walk home.