Two discourses that play a role in this commercial both have to do with the displays of identity. Instead of Betty White, picture the man playing football like Betty White (the view of his fellow teammates).  The main character was failing to display his identity as a young man who was in the least bit decent at playing football with his friends. This could make him seem like "an outsider with pretensions to being an insider" as Gee says (p.529). A more physical identity discourse takes place comically as we watch Betty White play a very aggressive sport, get tackled into the mud, and even bad mouth a teammate about his girlfriend. Betty White who is now 89 years old (ChaCha), would not be physically capable of going through this aggressive behavior of being tackled. The badmouthing however, though possible for Betty White to spout out, I feel like primary discourse comes into play here, where she is an older woman, raised more strongly on moral values within her family circle and wouldn't be talking about another player's girlfriend in that manner. That is just my opinion though. These two discourses create humor and a perfect commercial sales point for Snickers. "You're not you when you're hungry" or in other words there is a major discourse here where the "you" everyone thinks you are is out of place.

ChaCha:http://www.chacha.com/topic/betty-white/news/happy-birthday-betty-white-how-old-is-she-today