i keep losing my keys

Last night, I couldn't find my keys. I looked around in all the normal places - the giant key on which I hang my keys, the table by the door, the counter, the dining room table, the coffee table in the living room, my coat pocket - you know, the usual.

They were nowhere in the house.

Finally, on a brainstorm, I check the door of the house, which I had locked from the inside.

Yup. Keys in the door, on the outside.

I feel like that has happened before.