Correfocs, or "fire-runs" in English, are among the most striking features present in Catalan festivals. In the correfoc, a group of indivudals will dress as devils and light fireworks. While dancing to the drums of a traditional gralla, they will set off their fireworks among crowds of spectators. The correfoc can come in many forms. Some are simple parades using fireworks and effigies of the devil. In Sitges, it is common for a crowd to line a street, while participants run through a tunnel of fireworks. In Barcelona and Tarragona, the correfoc is run during the Festival of La Mercè, in September. Another typical Catalan folkloric expression of this sort takes place in L'Arboç. The highlight of the village's feast is the Carretillada. In the evening of the feast day, the town square is made to look like Hell. For nearly half an hour, "devils" burn their carretilles (carts), jumping around ceaselessly, while a large "sceptre of Lucifer" and the "pitchfork of the Diablessa (She-Devil)" shoot fire-jets and other pyrotechnics. Every year, the "carretillada" is a bit different, because the 'colla' (group) does not give up novelties that are added each year to add to the spectacle.