Amsterdam, Netherlands
The next day I was supposedly traveling to Amsterdam for my free weekend, however for whatever reason, my flight got booked the day after. I went all the way to the airport (14 euro train ride one way to get there) only to find out that I was booked for a friday flight, not thursday. I was so upset I couldn't even think about it without wanting to punch a wall. It was the most upsetting thing I've ever had to deal with only because I had spend so much money...