as pizza de cancha ("pitch pizza"). In Spain and Bulgaria, it is very common to eat sunflower seeds during the match. Although not in the whole of Bosnia and Herzegovina, but especially in Sarajevo, ćevapi are commonly seen to be sold around the stadiums before and after the matches, and people can often be seen selling pepita and juices in front of the entrance of the stadium and on the stands during the match. In many countries with drinking culture, football has been associated with alcohol consumption. This can be before, during and after the match, with drinking occurring inside the stadium, sometimes illicitly, as well as in pubs and bars outside. However, unwanted behaviour caused by drinking has led to the banning of the sale of alcohol to general supporters in stadiums across the UK, although most English and Welsh sides continue to sell alcohol within general stadium areas, with only clubs in Scotland being subject to a blanket ban following rioting after the 1980 Scottish Cup Final. Sales of alcohol still occur in executive lounges. Some teams and countries have Supporters Clubs which have friendly drinking reputations. However, some countries are more associated with drunken hooliganism as mentioned in the violence section below. More recently research has cast doubt on the effectiveness of alcohol restrictions on reducing the likelihood of disorder and violence, particularly involving English football fans such as the Heysel Stadium disaster. Hooliganism The level of passion with which football teams are supported has from time to time caused problems, and clashes between fans can result in violence. Some violence occurs by people aiming to cause trouble, a phenomenon known as hooliganism. Other fans group together in hooligan firms, which are organised gangs that seek fights with other firms supporting rival clubs. Both are sometimes known as the "English Disease," after the disorder caused by English fans travelling abroad to support either their club or national team in the 1970s and 1980s. However, violent organised supporters' groups surrounding football have been prevalent in other countries, most notably barras bravas that emerged in Argentina in the 1950s, some years before the appearance of significant hooligan firms in England. In addition, ultras, originally emerging in Italy in the 1960s, and in parts of Europe, Asia, Australia and North Africa, and torcidas organizadas in Brazil (emerged as non-violent groups during the 1930s but became violent ones in the 1970s)