Tiny plastic figures of Barack Obama and Gordon Brown relieving themselves in public have become online bestsellers. They are among a host of politicians, sports stars and celebrities to be given the dubious honour of being turned into a 'caganer'. Catalonians traditionally celebrate Christmas by placing a caganer, which translates as pooper, in a nativity scene. People find it fun to try to spot the tiny defecating figures which are supposed to bring prosperity and a good harvest. Traditionally, caganers would be small bearded men in full Catalan costume but these days, it's more likely to be a celebrity. Last year, Barcelona footballer Thierry Henry was the most popular figure sold. But this year, internet orders from the rest of the world, especially the US, have made Barack Obama the best-seller. Others immortalised into the mini figures include Mr Brown, French President Nicolas Sarkozy and wife Carla Bruni, plus Spanish tennis star Rafael Nadal.