He also sings "Lord I Lift Your Name on High" at 8:26 after the fumble recovery in OT.
I don't think it's a home-schooled thing so much as it is that he sings to himself on the field. Those songs just so happen to be Christian worship songs.
@Arken: Many non-prefab restaurants (including franchises like Denny's) have copied the look of 1950s diners for nostalgic appeal, while Waffle House uses an interior layout derived from the diner.
What do with this bit, then? Furthermore:
Some people apply the term not only to the prefabricated structures, but also to restaurants that serve cuisine similar to traditional diner cuisine even if they are located in more traditional types of buildings.
This is you. Others feel differently. Call it a "regional difference" or something and we'll all just move on.