Much to the chagrin many a fan, John Cena is nigh on invincible. Aside from the SummerSlam trouncing from Brock Lesnar, its difficult to remember the last time the 15-time world champion actually lost clean, thus making him one of the most protected WWE Superstars that weve ever seen. But for every hardcore fan who winces at the sight of another SuperCena rally, theres just as many youngstersif not morewho are clamouring for their hero to do what he does best and Never Give Up. Those three words have become the basis for Cenas mantra, his gimmick, and essentially his entire brand. The phrase has dominated on-screen storylines and company merchandise for years and years on end now, and given the nature of the current PG product, its easy to see why. But for all the preaching that Cena sends our way, all the propaganda that Michael Cole feeds us, and all the hype that his myriad colourful t-shirts create, can the leader of the Cenation really say that hes stayed true to his mantra throughout his career? This article takes a look back at Cenas career, identifying seven moments that call into question the validity of his slogan and the very essence of his character. Marks and minors, look away now.