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Big Bang Theory fans love the show for the epic adventures of the funniest nerd duo on earth, Leonard and Sheldon. Our selection of hilarious Big Bang Theory merch and shirts includes designs from the best moments from the series. If you took a closer look inside the pair's apartment, it's likely that Sheldon's shirts would look awfully similar to the ones we stock at Stylin' Online. Even Sheldon's favorite song, with the lyrics "Soft kitty, warm kitty, little ball of fur, happy kitty, sleepy kitty, purr, purr, purr," is featured on some of our Soft Kitty shirts and other merchandise. The adorable, smiling cat that has become an iconic part of the series has made his way into lots of our Big Bang Theory apparel, including a baby snap suit, a hooded sweatshirt and even a lunch box. In addition to a clever gift for the Big Bang Theory fan in your life, these items would make any cat-lover grin ear to ear, just like the lovable Soft Kitty herself.