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.
Dong, Dong, Dongdaemun Dong, Dong, Dongdaemun (동, 동, 동대문) is a nursery rhyme sung among Korean children, usually while playing a game. It is also the name of the game. Its melody starts identically to the German Kinderlied "Lasst uns froh und munter sein", but ends differently.