Elijah's mother keeps him from becoming a recluse during his childhood by giving him the perfect motivation to go outside on a regular basis.
A young David pulling his college sweetheart from the wreckage of a car accident by sheer brute strength and force of will. Not to mention immediately after that when he fakes an injury so that he will have an excuse to grant her request of him quitting football. This is a young man giving up guaranteed fame and glory (considering his unique talents) for love.
After David makes his first foray into superheroism, he covertly slips Joseph the newspaper article from outside his wife's line of vision, and when Joseph looks at him inquiringly, David just gives a small smile and nod, which leads to Joseph's (very subtle) Tears of Joy.
David saves two young children and they in return save him at his most desperate hour, not to mention their (the children's) darkest.