JPlop Goes the Weasel's title is a pun on an English nursery rhyme that is often played by what toy?
Pop Goes the Weasel “Pop! Goes the Weasel” is an English nursery rhyme and singing game. It has a Roud Folk Song Index number of 5249. The jack-in-the-box children’s toy often plays the melody.
Oh Dear! What Can the Matter Be? "What Can the Matter Be?", also known as "Johnny's So Long at the Fair" is a traditional nursery rhyme that can be traced back as far as the 1770s in England. There are several variations on its lyrics.