Its funny you guys mention this. I actually know of someone who kind of screwed up his life like this. He got accepted into medical school same time as me. What happened was he got accepted then went on a 3 month binge crazy of drinking cuz he was celebrating. He messed up his last semester and didn't finish on time. He then couldn't get into medical school the following year either. His parents were really upset with him and pretty much put him in time out for a long time, no money, didn't like he was staying at the house. His girlfriend dumped him, that was probably the best thing for him anyway. He was living in shelters and getting food from shelters as well, i think for a couple years. Fast-forward 5 and a half years. He now does re-inactments of the harry potter movies at kids birthdays, and if you pay him extra he can play the guitar and sing a little. So i would probably not mess up my last semester in undergrad.