010223c

One time when I was a kid we were visiting relatives in Washington DC and we went to a small museum. I think it was African art. I went through the museum and saw everything I wanted to, and then sat down on a chair in the lobby. I think I must have been reading a book. My family finally finished scrutinizing the exhibits, got all the way home, and were getting out of the car before they realized they had forgotten me. Fortunately, it was only about a 20-minute drive. Not the only time I've been left somewhere! Hints?