This is one of the old school Crash Course videos, created in 2012. In it, they talk about the sliding filament theory as though the actin and myosin filaments were middle schoolers trying to get jiggy with it at a dance. At around 5:00 the first mention of the middle school dance analogy takes place, but then there is an aside that discusses the discovery of the sliding filament model. This little "biolo-graphy" is really interesting, but if you want to skip it, the true simile begins around 8:25.
Check it out! It's informational and funny (aka memorable!).