[SmG Batman]

I came to know that the line, “Ringa Ringa roses, pocket full of posies” is actually from Dan Brown's Inferno. 

It is derived from the Great Plague of London in 1665. Allegedly, a ring around the rosie was a reference to a rose-colored pustule on the skin that developed a ring around it and indicated that one was infected. Sufferers would carry a pocketful of posies in an effort to mask the smell of their own decaying bodies as well as the stench of the city itself, where hundreds of plague victims dropped dead daily, their bodies then cremated. Ashes, ashes. We all fall down.