This short video shows the milkmaid’s grip or milkmaid’s sign; rhythmic squeezing when trying to grip and hold the examiner's fingers.

This short video shows the uncontrollable, sometimes jerky movements of the arms and legs associated with Sydenham chorea. 

This short video shows spooning, which is a classic presentation of Sydenham chorea. Spooning presents as flexion of the wrists and extension of the fingers when a person attempts to hold

Demonstration of a young boy with Sydenham chorea