How to buy more time for an assignment to be submitted in soft copy.

CaptionI did this back in University when I couldn't manage to do my case study analysis on time. I created a 3 page word file filled with nothing but tall rectangular boxes. Emailed it to professor. The following day, when my analysis was done, I emailed him the correct file and told her the previous file seemed corrupted when I double checked it later. He didn't mind.