Travel difficulties
One time, I was going to OSCON, which is quite tricky to get to because it's in Portland, Oregon. It's right on the other side of the U.S. Even from London, that was quite a challenging flight.
From Seville, it was easier for me to get the train to Malaga, which is two hours away, then get on a flight from Malaga to New York, and then fly from New York to Portland.
That wasn't the worst set of circumstances, but the trains between Seville and Malaga are really weird. They're not once an hour: there's a weird clustering of trains at certain points of the day. I caught the earliest possible train to Malaga and I got there, but I was five minutes late for getting through security at the airport. I had this brilliant business-class flight lined up that I was really excited about, but I wasn't allowed on the plane. I had no luggage and the flight wasn't for 45 minutes, but they said no.
I had to get on the train and go another two hours back...