ABBA - you know, the Swedish pop group from the 70s that sang "Dancing Queen" and "Mamma Mia" and had a jukebox musical created about them that was then made into a movie starring a drunk Meryl Streep? Them? Sure you do. You know how they always wore completely bananas outfits? Well, according to a new book released to celebrate the 40th anniversary of their win at Eurovision, their outfits were so crazy because of tax laws. Any stage outfits could be counted as deductions - as long as they were SO outrageous that no one would wear them on the street. Let's take a look at some of the best, most outrageous, most tax-deductible ensembles sported by the Swedish songbirds.