Robert Scoble was one of the first non-Googlers to get his hands on Google Glass, he was also one of the first non-Googlers to break his Google Glass. He shared a picture on Google+ of his broken Glass.
Supposedly it is not all that uncommon. There are others also who have mentioned they broke their Google Glass in exactly the same spot.
I believe Google replaces them under warranty anyway.
I have yet to receive mine, the wait is a horror (1st world problems) but I will make sure to be careful wearing them around my kids.
This post is part of our daily Search Photo of the Day column, where we find fun and interesting photos related to the search industry and share them with our readers.