During Carnival, some people cover the face of their friends with water-paint (red, blue or green).
First day of Carnival 2010 in Jujuy Capital (Argentina).
This was a great Carnival party in the old (disused) train station in San Salvador de Jujuy. Music, cheap red wine (often mixed with CocaCola) and a great crowd having a lot of fun.
During Carnival festivities in the Andes mountains, a local tradition consists in throwing white talk powder, spray foam and confettis to the face of others while drinking and dancing to the music of marching bands.