What happened at the Saint Valentine's Day manicure?

Al Capone actually liked to have his nails done, and was a fan of pink polish. Although he only had the polish on his toes, it was not long before the word got out. His friends would sometimes call him Al CaPink, which he was not appreciative of when he found out on February 14, 1929. This led to the St. Valentine's Day Massacre later the same day.