DDI went down Fri evening, I was talking to a fellow player on the phone, I had just used it, and he went to, found it was down, I brought it back up, and blat, dead. The usual 'server screwed up but we refuse to give you details' error.
It stayed dead until Sun afternoon, just after the game started. So instead of everyone bringing their newly-leveled character, we had to quickly update & print them out, delaying the game - then the printer ran out of ink.
But, y'know, how hard is it to remember one new feat and a +1 to everything?
Our DM ran a fun session, anyway...