The Big Bang Theory fans call out Raj plot hole as he survives Sheldon’s chemical explosion during desk war – The Sun

Taking to online forum moviemistakes, one fan wrote: "During the final scene of this episode, Sheldon steps out of his office wearing a gas mask.

"He engages Leonard in conversation where he then states he is making hydrogen sulphide gas (more commonly known as H2S).

"Leonard correctly identifies this as highly flammable.

"However, this gas is far more dangerous and is harmful to the human body at as low a concentration as 20 parts per million (ppm), can cause permanent damage at 100ppm and is fatal after two breaths at 500ppm.

"So for Raj (and his bird) to be completely unharmed in a high concentration of H2S (noted by the fire) is impossible."

But this isn't the first time viewers of the show have spotted a plot hole in one of the programmes story lines.

Recently another blunder was highlighted in season eight during Sheldon and Howard's engineering quiz.

Sheldon started to get too big for his boots when he was given a junior professor job by the university and put in charge of teaching graduate students.

His friend and co-star Howard Wolowitz (Simon Helberg) specialised in engineering and offered to teach his class, but Sheldon thought he wasn't clever enough to teach his favourite subject – physics.

Therefore, keen to prove his buddy wrong, Howard tested Sheldon with some quick-fire questions.

Unfortunately, one studious viewer has noticed a pretty glaring error with one of Sheldon’s answers.

One fan mentioned in an online forum: “When Howard is asking Sheldon engineering questions, the first question is ‘How do you quantify the strength of materials?’

"Sheldon answers ‘Young's Modulus’, and Howard admits that is correct."

They continued: “But it's not correct – Young's Modulus quantifies a material's elasticity, not strength.”

While this is a rather minor criticism of the scene, a quick check on Google will tell you that the fan is indeed correct.

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