We were hosting some friends in Warsaw while I lived there with my family. It was a middle aged couple from Netherlands. One evening they went for a walk in the city when a few young women approached them near the Palace of culture. They asked the couple to sign a petition concerning natural environment. They signed. They there were asked to pay 30 Polish Zloty. We didn’t know these kind of scams were popular in Warsaw, otherwise we would have warn them not to sign any petitions.