Maybe he was distracted by his <a href="http://www.bmezine.com/news/people/A10101/trepan/">DIY trepanation</a>.
<img src="http://www.bmezine.com/news/people/A10101/trepan/done.jpg">
"... We were using a flex-shaft Dremmel with a ball burr and a flame-shaped burr. The process would turn the bone and marrow to dust which would be rinsed away as we went, down to the meninges, at which point the brain would be pulsating visibly as our sign of success. We began drilling and the sound was resonating extremely loud through my skull. ..."
Tim Allen's
other home improvement show.