Rather not hear the sound of paper popping and crumpling as it jams a printer? Curling the corners of cut sheet paper back makes them less likely to get mangled in the paper slot or worse yet in the platen gap or the printhead.
Cut sheet paper often seems to curl up at the corners on the print side. This may be a result of its treatment with image enhancers and paper brighteners that make it respond to humidity differently from the back side. In any case, the remedy is as simple as curling the corners back just enough to keep them from sticking up and getting caught in your printer. Setting the platen gap to accommodate heavy or light weight paper is also important, but won’t prevent jams caused by curled up corners. Thanks to Larry Danque for this tip.