"when the boss comes in at 5:30 in the evening and says he has a presentation at 10am at CeBIT the next day and needs 40 slides..."
There are 4 little words that come to mind when this happens to me. "sucks to be you".
Or conversely "it's really going to be a log night for you, boss."
Usually when this happens the "Boss" has known about it for 3 to 4 weeks, then the Oh Shite moment happens and remembers the night before. Usually when his boss asks if he is ready for tomorrow...