Just did the Colombo turnaround. I failed to notice my passport had less than 6 months left on it so instead of spending a couple of days I spent a couple of hours in Colombo. At first, counter staff was not going to allow me to go but I talked to a supervisor and told them that since I didn't check any bags I wouldn't have to go through immigration. The airport is a beehive of activity at 2AM with shops, restaurants and the internet cafe all open.