"Nursery Rhymes" joke

Jack be nimble.
Jack be quick.
Jack jumped over the candlestick.
GREAT BALLS AFIRE!!!
Old Mother Hubbard
Went to the cubbard
To get her poor dog a bone.
But when she bent over
Rover took over
Because this dog had a bone of his own.
Mary had a little sheep.
She took it to bed one night to sleep.
The sheep turned out to be a ram.
That's how Mary had a little lamb.
Peter, Peter pumpkin eater
Had a wife and couldn't feed her.
So he ate her.