Why can't I sit?

This blog has been a few weeks in the works. I never seem to be able to sit at a computer alone for more than two minutes. The moment I sit down the kids start crawling all over me. It's pretty much the same thing no matter what I am sitting down for. Why is it that they are completely happy playing as long as I am standing up? The moment my knees touch the ground they think I am a human playground. It's a good thing the bathroom has a lock!