This is kind of when my day of breaking stuff turned crappy. I wanted to get two 7 inch sections of 2x12 at once. After trying twice, I realized the board that was on bottom both times wasn't like the other two pieces. After an elbow strike you can see where I point out the problem. The particular way a knot was formed in the center of the board made it much harder to break. I had the same problem earlier in the day when I had to take a second try on a 14 inch board using a palm strike. This one, much later in the day and on a much less solid floor, I had to use an elbow on. (less info)