 I know. Please. We all know that. 35, 38 years ago. But he was writing a disk operating system, and then when he would have a DOS ready, we would sit down and try to break it. We would try to make a bug happen, and once we had a bug, he would fix it. That's the way you would go through and make sure the software could happen, and it would not affect the end user's performance of that software.