Active sitting is new to most Americans, and so, although the problem you suggest hasn’t to our knowledge actually happened, it is likely that sooner or later someone will have an unpleasant surprise. We recommend that if possible everyone new to active sitting have a ten-second explanation and perhaps demonstration. If you’re sitting on a QOR360 chair for the first time by yourself we suggest that you place the back of the chair four of five inches from a wall to foreclose the possibility of falling backward.