Some months after I moved into my house, a friend gave me a ride someplace. When I got home, I discovered I was locked out - even though I had my house keys!

The front door was chained, and the dead bolt was probably stuck too.

The back door opens into my garage. The garage's people door had an indoor style lock that didn't take keys - and it was locked.

The garage's car door required a remote opener - which was safely in my car in the garage. Uh-oh.