“The Big Bang Theory” is full of hilarious jokes, but what`s not bazinga is Sheldon Cooper`s chord. Here are 10 rules of Sheldon`s agreement on roommates that everyone should follow: like the relationship agreement between Sheldon and Amy, the roommate agreement is the sacred document that sums up Leonard and Sheldon`s responsibility as friends and room. This covers all needs from which you can order the right protocol in case of a zombie outbreak. And thanks to all this, Leonard and Sheldon have become better buds than ever… or, you know, at least they didn`t tear themselves apart. Follow these rules, and you`ll be friends like Sheldon and Leonard in no time! 9. The Rule of Superheroes Image: YouTube 10. The Crazy Rule “The Big Bang Theory” will air Thursday at 8:00 p.m. .m ET on CBS. Although, #10 shouldn`t be much of a problem for Sheldon and Leonard….