This document summarizes a social experiment called "Guiametrorisc" carried out in Barcelona from May 18-21, 2010. The experimenters distributed 10,000 false leaflets across 20 subway stations with instructions on how to respond to unlikely emergency scenarios like terrorism or biological attacks. They also wore fake uniforms to make the campaign seem legitimate. Interviews were conducted without revealing the campaign was fake. A mockumentary was later exhibited portraying the campaign as real, and some people still believe it was a genuine informational campaign.