When my youngest daughter was in her early teens, she really wanted to see California.  So, I used some of my airline and hotel points and booked us a trip.  I was trying to make the trip fancy and memorable, so I was trying to book us first class.  If anyone is an American Airlines frequent flier, then you know how much of a hassle it is to try to redeem points.  I swear, they have an algorithm that tries to keep you from getting both the outbound and return with points.  I was finally able to do it, but it meant we departed from Dallas Love Field and returned to Dallas-Ft Worth.  Normally a hassle, but not a big deal for a special trip. 
Anyway, some weeks or months pass and on the day of our "big trip" the daughter and I head to the airport.  Yup, you guessed it, I went to the wrong airport.  Fortunately, the ticket agent was able to get us a new flight from DFW, it just wasn't first class.
My daughter still reminds me of it.