Nothing major here.

Left my laptop at TSA ORD T1. Realized it about 15 minutes after takeoff. Was able to pick it up on my return from DFW.

Another time I was in SAN. I had some time to kill before my flight so I decided to drive around for a while. My wristwatch, that my wife had bought for me, was bothering me so I thought, "I'll strap it onto the steering wheel that way I won't forget it." Of course I left it on there. Realized it as the rental shuttle was dropping me off at the terminal. Ran inside, checked in, and then went back to Hertz. They claimed that it wasn't in the car and the manager told me "They wouldn't steal it. It wouldn't be worth it to risk their jobs."

Tried to check in at the Santa Clara Hilton when I had accidentally booked the San Jose Hilton.