Worst travel experience when coming back from holiday?

I remember specifically because it was the day Muhammad Ali passed away. I was returning from a conference in CA. Flight landed about 11:30 p.m. and once we deplaned I went to the restroom. Got to baggage claim, all luggage was gone and had been locked in Delta's office and they were gone for the night. I ended up spending the night in the airport because I'd left my car keys in my luggage. The Delta counter opened about 5:30 a.m. Needless to say, I did not sleep. Once I got my luggage, it was another hour before I found the correct shuttle to get to my car.