I'll be grazing on appetizers and antipasto throughout the afternoon: nachos, pigs in a blanket, mozzarella sticks, buffalo wings, veggies & dip (gotta keep it healthy of course).
As for the game itself? I'll be barricading myself in a small, dark room dominated by the TV and speakers. No human contact outside of texting during commercials, thanks. I'll be a bundle of nerves and watch it standing.
After the game I'll get a 'second wind' -- either rejoin humanity and have a celebratory snack - or - bury my pain in leftovers with phone/TV turned OFF.