Back in '92 or '93 when I was a junior in high school, I had this chemistry teacher who was just brilliant. She went to a conference in San Francisco, but on the day she was supposed to be back, she wasn't in the classroom. A few minutes after the bell rang, another teacher came in just laughing, and told us that instead of getting on her flight back to San Diego, our teacher had accidentally gotten on one going to Seattle instead, and hadn't realized it the plane actually landed in Seattle. She finally made it back to SAN a day late, and completely embarrassed - the rest of the science department would not let her live it down for weeks. They kept posting signs "directing" her to her classroom, her office, etc.