We report here a case study on one human subject, who found to manifest a tight coupling between excretion and reading activities. Although defecation process is known to be controlled voluntarily by means of anal sphincters, the intentional relaxation of these sphincters per se did not produce any visible effect in the individual under study. Only when the subject was simultaneously presented with sufficient amount of printed text of any kind, written in Russian or English, the defecation process started. The extinguishing of the trigger stimulus from the subject's visual field resulted in almost immediate suppression of the defecation. We found no effect of text relevance, quality or informational content on its stimulation efficiency. Moreover, if the text happened to be completed before all fecal masses were evacuated, the same text could be used repeatedly without any detectable decline in its stimulation efficiency. It was also noted that a novel content may sometimes exert lesser effect as compared with previously known texts of the same length. We suggest that a substantial level of tonic inhibition, which originates in higher brain cortical structures, suppresses neural centers that control sphincter relaxation, keeping them in the deactivated state. The arrival of a specific visual input unlocks these centers, bringing their activity above a threshold. Our findings demonstrate the existence of a tight link between visual and excretion systems, which formerly were considered to be largely independent.