Summer 2011, Frankfurt airport. I should have had a flight around 8 pm , but despite getting email confirmation and all, my booking had not gone through. I had to spend the whole night in the airport until the next available flight to Italy at 7 in the morning.
I was pretty desperate but it went better than I thought. At night there's always people and police around and some bars only close half an hour to clean out and sell things to eat all night. I also had my Kindle with the Game of Thrones books on it, so plenty to read.