Forgetting stuff and missing the plane

I was going to catch a plane, but I kept managing to forget a few important items back at my place (seemed like it was a third story apartment or dorm room in a large building, with one or two roommates). I kept getting outside and down the street, or even all the way to the departure place and realizing I'd forgotten something. So I would rush back to my place, which wasn't terribly far away, but after twice or three times of this, it appeared that I had missed the departure time.