1. Season 3 Episode 14: The Ball Pit
The classic extended gag: Sheldon is obsessed with finding the answer to a physics problem and so sneaks out in the middle of the night in the hope that using the balls as physical representations of atoms will help him find his answer (he's already tried and failed with lima beans, peas and marbles). Clearly, he's not meant to be at the mall's ball pit at night and so Leonard must go and retrieve him after a security guard's phone call, but this just results in Sheldon hiding in the ball pit, forcing Leonard to chase him round. Sheldon finds this ball pit hide and seek hilarious, as shown by his utterance of "bazinga" every time he emerges. The confidence that the creative team had for this scene must have been high, as they allowed it to run for a good minute, which is a long time when it's essentially the same joke over and over. However, luckily for them it paid off, and it has become one of The Big Bang Theory's most memorable moments. If you have any other favourites, let us know in the comments, and remember to enter
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