I am usually walking around with some kind of big bruise somewhere and no clue how it happened. If I am working on something I get so focused on what I am doing that I just don’t notice when I have banged an arm or leg on something.It's not a broken anything but did you ever notice a huge purple, green, and yellow bruise on your leg or arm, and when someone says "what did you do" you don't have a good answer because you have no idea what created that bruise?