#2 John Cena's promos
Many of John Cena's verbal assaults on The Undertaker have centered around the notion that his ego is too damaged to risk damaging it even further. He has suggested that he is "broken down" (a statement he later rescinded, citing his workout videos on his wife Michelle McCool's Instagram), that he is a coward, that he is not the "God" that the WWE Universe has made him out to be, etc.
Check out which wrestler EC3 finds cute RIGHT HERE
If that last bullet point isn't a teaser, I don't know what it is.
In the promo posted above, Cena overtly refers to The Undertaker as a "man" on multiple occasions. Not as a Phenom, not as a Dead Man - as a man. A man with emotions; one that cares about his reputation and his well-being. A Dead Man cares not for these things. A Dead Man is not a coward, for a Dead Man fears nothing. That said, if he were the "Dead Man," he likely would have answered Cena by now.
So how, then, can he prove he's not a coward? Simple - by being a "Badass".