In 2006, students at Austin High School in Austin, Minnesota engineered a prank that capitalized on the unusual architecture of their school. A busy street separates two buildings on the school’s campus. Students can use the crosswalk or an underground tunnel to get from one building to the other. At an appointed time on the day of the prank, 94 students began filing across the street, using the crosswalk. Then they circled back through the underground tunnel and crossed the street again—and again, and again—creating an endless stream of pedestrians. Traffic was tied up for nearly 10 minutes as cars lined up waiting for the students (including one dressed as a cow and another as a chicken) to finish crossing.