Being a person is hard, and sometimes our brains simply cannot help us carry on the small actions that make up our day.
So much of our lives are carried out on autopilot, the way we pour our freshly brewed coffee, the dos and don'ts of small talk, being able to tell an escalator from stairs, so when our brain decides to take a beat - we can quickly find ourselves failing at embarrassingly mundane tasks.
I ride my bike to work almost every day. I had a flat, so was taking the train one day and didn't notice until I was outside my building that I was wearing my bike helmet.
All the floors in my apartment have the same layout. The elevators take forever, so it's not uncommon for people to hit the elevator button and then say "f*ck it" and take the stairs. Someone did that today so I got off on the wrong floor and walked over to where my apartment is supposed to be and tried to use my key to unlock the door.