My team and I participated in this year's ICFP programming contest - a weekend of very little sleep and lots of programming. This was the first year our team (i.e. The Black Knight Always Triumphs) took part.
We were amazed at the effort the judges must have gone through to prepare the problems. My favorite problems where writing the virtual machine that ran the problems and hacking into "user accounts" using their stripped down version of Basic which uses Roman numerals for line numbers.
We expect to finish under the first third of participants (that made it to the scoreboard) and we'll definately be back next year.