Funk balls are one of the latest crazes among teenagers in Brazil. Funk is the most popular style of music among the teenage slum-dwellers of Rio, and rival gangs of several thousand youths square up to each other as dj's hype the atmosphere to a fever pitch. Bizarrely, the signal for a riot to commence appears to have crystallised around the regular airing of the theme from the 60's television Western series 'Bonanza'. Ensuing riots have led to large numbers of fatalities, and proposed government action to prevent the craze spreading any further.