The Big Bang Theory: 15 Insane Details You Definitely Missed
4. Sheldon Adopts 25 Cats, Despite Supposedly Being Allergic To Them
Acclaimed sitcoms would be nothing without their dedicated fandoms, but often this can come back to hurt them. The unravelling of plot holes is where social media's finest detectives lurk in the shadows and for The Big Bang Theory, this meant questioning Sheldon's purported cat allergy.
In season one's "The Fuzzy Boots Corollary", Leonard is left dejected upon seeing Penny kiss another man and being romantically rejected by Leslie Winkle, leading to him adopting a cat. This is when Sheldon's asthma and supposed allergic reaction to cats is made known, however, by the show's fourth season, he has made a miraculous recovery.
He himself adopts a cat - Dr Robert Oppenheimer - in "The Zazzy Substitution" after he and Amy break up, with his newfound love of felines quickly skyrocketing to the point his and Leonard's apartment is full of cats. Sheldon doesn't sneeze once during this entire process, and when Leonard brings Sheldon's mother in to talk some sense into him, she ignores his supposed asthma condition as well.
So, was it the case that Sheldon never had asthma and only told Leonard as a means of keeping the apartment animal-free, or was it a lack of attention from The Big Bang Theory's writers? You decide.