If you thought that nursery rhymes you learnt in school were all that innocent, you're in for a shock. Or a surprise, depending on how dark your imagination is.

5. Ring a Ring o' Roses

Ring-a-ring o' roses,
A pocket full of posies,
A-tishoo! A-tishoo! (Hushha! Hushha! - if you grew up in India)
We all fall down.

There's no solid proof for this claim (why let facts get in the way of a good story?) but some experts claim that this was actually about the Black Death that plagued Europe in the 17th century. A rosy ring was one of the first signs of the foul smelling disease. People carried posies of herbs in their pockets to ward off the stench. And sneezing and coughing was the final symptom. "We all fall down" is pretty self-explanatory.

6. London Bridge is Falling Down

London Bridge is falling down,
Falling down, falling down.
London Bridge is falling down,
My fair lady.

There are some who say the poem is about King Olaf II of Norway, a viking invader destroying the London Bridge in the 10th century but then there are some who believe that attack never happened. The other origin tale is much darker. Since the bridge collapsed one too many times, there are some who believe it took human sacrifice to rebuild it in such a way that it never fell. Although there isn't any archaeological evidence to support this, but it is said that the base of the bridge was made from skulls and bones of children.