 CONT: SPOILER: When Mark throws the jelly donut at Franks car, we  see it hit the windshield on the drivers side. When the camera  angle changes to an inside view, the donut splatter is in the center  of the windshield, and when Frank switches on the wipers the  majority of the splatter is picked up by the right wiper. After  another cut to an outside view, the splatter is back to being mainly  smeared around the left wiper.