Lego Batman: Legacy of the Dark Knight was a fun tribute to the Caped Crusader when it launched earlier this year, but if you’re tired of saving Gotham, you can embrace chaos with two of the city’s greatest villains: Harley Quinn and the Joker. The duo are headlining the game’s Mayhem Collection expansion, and just like Batman, they’re dressing in style with multiple outfits that you can unlock during their caper. GameSpot can exclusively reveal one of them: a classic…