In 1924 the son of the president of USA died because he played tennis without socks: "On 30 June 1924, Coolidge’s two sons, John and Calvin Jr., set out to play

In 1924 the son of the president of USA died because he played tennis without socks: "On 30 June 1924, Coolidge’s two sons, John and Calvin Jr., set out to play tennis on the White House tennis court. 16-year-old Calvin Jr., in a hurry to get out on the court, donned tennis shoes but no socks. Young Calvin’s sockless exertions raised a blister on one of his toes, which soon became infected. The modern antibiotics that would quickly clear up such an infection today did not exist in 1924, and by the time White House physicians were summoned to treat Calvin Jr., it was too late: he died of pathogenic blood poisoning a week later."