In the video seen above, a man folds a piece of A3 paper (11.7 inches by 16.5 inches) in half five times by hand. Then things start to get interesting. For the fifth and sixth folds, he brings in his hydraulic press to give the paper a little extra crease. He attempts to do the same for the seventh, at which point, the paper seems to explode, leaving a brittle mass where the once-flexible paper used to be. What the heck happened?