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To see that be the pinnacle of this season was really cool, we’ve all come such a long way. ‘ THE BIG BANG THEORY ’ FINALE RECAP : SHELDON AND AMY STRUGGLE WITH LONG DISTANCE AND TEMPTATION That was n’t the only behind-the-scenes moment that the cast shared with the Comic Con crowd. According to Entertainment Weekly, Kaley Cuoco and Galecki revealed the circumstances surrounding an on-set injury from a prank gone awry. In an effort to shock the cast and crew during a scene in which the two characters were fighting, Galecki jokingly pretended to punch his co-star in the face. However, the actress' head accidentally caught a chair while she was falling and the end result was stitches in her eye brow. ‘ THE BIG BANG THEORY ’ ACTRESS MAYIM BIALIK RECEIVES ‘ DOOGIE HOWSER ’ ROYALTY CHECK FOR TWO CENTS.