We examine stress clash in perception, asking to what degree listeners perceive speech as metrically regular. We assess metrical regularity through a stress perception task carried out by untrained listeners annotating transcripts of spontaneous conversation and sentences designed to be metrically regular. Results show listeners report perceiving fewer stress clashes than predicted by random placement of stresses or by concatenating the citation form stress patterns of each individual word in a given sentence. These results suggest that listeners perceive spontaneous conversational English as metrically regular.