After fighting Daniel Bryan on the 2/14/11 RAW, he gives Jerry Lawler his deepest condolences after announcing that Lawler's mother passed away the Saturday. Then it gets—somewhat—more heartwarming as he wants a good fight from Lawler at Elimination Chamber 2011 and not let his mom's passing get in the way of their fight, setting Lawler off to be more of a Worthy Opponent than some wrestler he's off to fight.
More importantly, he did it without turning it into an insult at all, which is what makes this fit here.
The photo◊ of him backstage with "Angry Miz Girl." Both simply because the photo is all kinds of adorable, but also because he was able to change her opinion of him simply by meeting her.
In a twisted way, Miz celebrating his stunt double Damien "Mizdow" pinning Sheamus on the 10/20/2014 edition of RAW is heartwarming in itself.