Last year I had three(!) interns call off "sick" on a Monday. In a typical year, there will be two calloffs out of all 12 interns, so three in one day was unprecedented.
And the next day, they told me they were at a party and were too hungover to come in. So you could probably guess which three interns got no job offer from us after graduation.
Yeah, it's probably going to happen to everyone at least once, but when you are doing an internship, when you can tell me in advance you have a heavy school load next week and need to take next Monday off without any problem, don't party on a Sunday night to the point you can't come in to work.