Related: The Big Bang Theory: 10 Reasons Why Amy And Bernadette Aren't Real Friends
However, everyone knows their friendship wasn't plain sailing as Sheldon and Penny got themselves in many arguments. Sometimes fans couldn't help but question if they would have remained friends if it wasn't for Leonard since Penny and Sheldon can be quite toxic and immature. Would you like some examples? Keep reading to discover the 10 reasons why Sheldon and Penny aren't real friends.