“Contrary” is one way to describe a murderous psychopath. This popular English nursery rhyme, which reads like a solicitation for gardening advice, is actually a recounting of the homicidal nature of Queen Mary I of England, a.k.a. Bloody Mary.
A fierce believer in Catholicism, her reign as queen—from 1553 to 1558—was marked by the execution of hundreds of Protestants. (Silver bells and cockle shells are torture devices, not garden accouterments.)