Tailgating is less of an art, and more of a science, but, like, really low-level science that's even before learning that some rocks are different from other rocks. Doesn't mean it can't still be tricky!! We've all seen true parking-lot ballers who bring TVs, and couches, and Nevin Shapiro, but you don't really NEED any of those things to get down and dirty and into that blessed state where the game itself becomes completely unimportant. So we rounded up a list of the 25 things that you absolutely do need, in descending order of importance -- No. 1 is more essential than No. 2, which is more essential than No. 3, and now we're just counting so we'll stop talking. After we do the list, of course. 1. Beer Have you ever watched a football game sober? That wasn't a rhetorical question.