Few successful bands walked away from a winning formula as quickly as emo heartthrobs Panic! At The Disco did on their 2009 second LP Pretty. Odd. The group's first album A Fever You Can't Sweat Out sold millions of copies, scored a massive hit with "I Write Sins Not Tragedies" and got them on the cover of Rolling Stone. The group began imploding when it came time to craft the follow-up: They decided to drop the exclamation mark and make a Beatles-inspired pop album. Fans and critics hated the disc, and in the wake of the fiasco two of the four members quit the band. The remaining members quickly brought back the exclamation mark.