We investigated the perception and recognition of errors in a population of practitioners and academics in professional and technical communication. Specifically, we measured 303 participants' botheration levels of 24 usage errors and then correlated those results against their ability to recognize the errors. Results indicated that practitioners were often more bothered by errors than academics and that participants' overall botheration level might have fluctuated over the past 40 years. Participants' botheration level also appeared to associate with their ability to identify error. Finally, we found that participants' gender, job type, and years working in the field influence their error perception.