My transport phenomena final exam was at 5 PM. The professor walked in, placed a single piece of paper with the exam questions on the desk in front of the whiteboard, and said "you have until 8 AM tomorrow to leave the solved exam at my office. You can use whatever you want. I recommend pooling efforts to make it in time".
It took 35 chemical engineering majors all night in a classroom to answer 5 questions, 3 of which were multiple choice. It was an exercise in spontaneous labor division and teamwork because we had no time to waste figuring it out. We all passed.