I forget my lock often. Also forget the pannier when going grocery shopping. Hey I am getting old.
Once I even forgot my pannier filled with groceries on the sidewalk of the grocery store! I figured I would be buying a new bag and groceries for sure. Jumped in the car to save time and drove back to the store. There the bag was right where I left it!
And guess I can't blame my age for my forgetfulness. Once when I was a much younger man, I returned form a service call in Denver. At that time you were able to leave things at the sidewalk of the airport. I piled up my tools, the oscilloscope (about a $2000 scope), spare boards etc. Went to the parking lot to pick up the car. Getting home, I was exhausted. I was thinking I would take my clothes and the scope out of the car and leave the rest for the next day. Then I thought scope? Turned around and oh no! I forgot to pickup my gear! Drove back out to the airport and there it was right where I left it.