Clearly, one of the biggest TV successes of the modern era, The Big Bang Theory not only lasted an impressive 12 seasons but the show remained a ratings behemoth throughout its run. Even though TBBT was highlighted by its ensemble cast, there is little doubt that Sheldon Cooper was its most popular character.

Given that a sitcom like The Big Bang Theory was written by a wide array of people over the years, it is understandable that from time to time some character inconsistencies fell through the cracks. For that reason, fans of the show tend to be pretty forgiving when it relates to the aspects of Sheldon’s character that don’t make sense. With that in mind, it is time to take a look at this list of 15 things fans choose to ignore about The Big Bang Theory’s Sheldon Cooper.

15 Sheldon’s Shifting Weight Claims

When it comes to this list, we are going to touch on the fact that Sheldon Cooper is exacting several times. For that reason, it makes no sense when he gets simple things wrong or is inconsistent about something. A perfect example of the latter, we can’t make sense of the fact that during the episode “The Luminous Fish Effect” Sheldon says he weighs 140 lbs. but in “The Porkchop Indeterminacy” he says he is 165 lbs.

14 Sheldon’s Convenient Ability to Build Things… Or Not

Often a character of extremes, during season 2’s “The Killer Robot Instability” Sheldon Cooper claims to not even know how to open a toolbox. While that moment is played for laughs at that moment, in the grand scheme of things it makes no sense as the character has boasted about things like building a CAT scanner out of his sister’s EasyBake Oven.

13 Sheldon’s Gremlins Mistake

Due to Sheldon Cooper’s passion for pop culture, he has often been seen passionately debating about the minutiae of movies, TV shows, and comics. Despite that, he quoted a movie wrong by saying the rules from Gremlins were: “Don’t feed the gremlins after midnight, don’t get the gremlins wet”. This is wrong because it is Mogwais you can’t do those things to and as a stickler for details, Sheldon shouldn’t have gotten that wrong.

12 Sheldon Buying Into A Myth About Albert Einstein

As a student of the history of science, Sheldon Cooper quoting Albert Einstein fits his character to perfection. However, when Sheldon was heard saying that Einstein defined insanity as “doing the same thing over and over again and expecting different results” it was hard to swallow. This is the case because many people think Einstein said that but he never did and that is the type of thing Sheldon would know.

11 Sheldon Forgetting The Details Of A List He Wrote

In one of our favorite throwaway Sheldon Cooper storylines, he spends an episode letting the roll of a dice decide everything for him. As a part of that process, he continuously checks a notepad where he has written down a list to find out what it means when certain numbers come up. The problem with this is that Sheldon has an eidetic memory, so he should remember everything he has written down.

10 Sheldon Mistaking Luke Skywalker’s Lightsaber

Due to the fact that Sheldon is a devoted fan of the Star Wars franchise, he loves the Luke Skywalker character. Despite that, he once told Howard to change the color of his car to “the pale blue of Luke Skywalker’s lightsaber before it was digitally remastered”. Sheldon never should have said that though, as Luke’s lightsaber was green and he only used a blue one when he wielded his father’s weapon.

9 Sheldon’s Handling Of His Paychecks

As The Big Bang Theory fans likely remember, during one episode it is discovered that Sheldon has a bunch of uncashed cheques in his desk. When he was asked why that is, he responds that he doesn’t trust banks. Given that cheques only have value because banks are willing to cash them, which is something Sheldon definitely would think about, he should have cashed them and held onto the money.

8 Sheldon’s Inconsistent Cat Allergy

From the beginning of this series, the fact that Leonard is lactose intolerant was often brought up. On the other hand, it seems the show’s writer forgot that during season 2 it is revealed that Sheldon is allergic to cats as he adopts a bevy of them during season 4’s "The Zazzy Substitution". That said, at least this inconsistency allowed us to see Sheldon say Zazzy which was hilarious.

7 Sheldon Suddenly Bragging About His Ability To Dance

Early on in The Big Bang Theory's run, Sheldon Cooper says that he both greatly dislikes dancing and that he is incapable of doing it. Yet, several seasons later, he goes dancing with Amy, he is great at it, and he brags that he learned the skill during his “cotillion training”. Clearly, the show’s writers had forgotten that his distaste for dancing had already been established.

6 Sheldon Forgetting The Details Of A Legendary Superman Scene

Yet another example of Sheldon being wrong about pop culture, this time around he was incorrect about arguably the most iconic Superman movie scene ever. While debating with his friends about whether or not a scene in which Superman catches a falling Lois Lane is scientifically possible, Sheldon says the hero “swoops down” to save her. However, during the actual scene, Superman is on the ground and flies up to her.