Video: Are these the most elaborate Christmas party outfits? The Christmas party thrown by British engineering firm Dyson puts others to shame with an elaborate design extravaganza. This year's theme was "topsy turvy" and featured a burning hydrant, upside-down living room and a robotic backwards bird. Meanwhile, employees tried to out do eachother with the most inventive costume as boss James Dyson turned up to judge the best entries. Engineers used cardboard, metal and discarded parts of Dyson technology to create an elaborate range of costumes, including an eagle with a four metre wing span, flying pigs and roller coasters. There was only one Santa Claus who arrived in a custom-made upside-down robotic sleigh. It will make your sequins and tinsel all seem a bit tame.