Times, they are a changing. Back in the 1970s and '80s, the good guys were cheered vociferously by the audience, as the right morals and ethics reigned supreme over the dastardly villains. Men like Hulk Hogan, Tito Santana, and The Ultimate Warrior entered arenas to deafening cheers because of their apparent desire to fight for good.
In the late 1990s, the anti-hero began to take over. The clean-cut babyface was no longer in fashion and World Wrestling Entertainment was somewhat late to the party, still trying to introduce vanilla heroes to the fans with the rationale of "well, it worked in the past". Luckily the penny eventually dropped, and the Attitude Era gave rise to such babyface stars as Stone Cold Steve Austin, The Rock, and Triple H.
Of course, the one thing we learn from history is that we don't learn from history, and WWE is no different in this regard. Roman Reigns is the latest babyface to be forced down the throats of the WWE Universe with the audience not being shy about their disapproval. John Cena has basically made a career out of this polarising spot.
Neither of those two men officially turned heel, but a number of times in WWE history the audience's disapproval of a babyface has actively led to a heel turn. Here are eight such times.