Pop Goes The Weasel
From Tardis Wiki, the free Doctor Who reference
"Pop Goes The Weasel" was a tune once played by Missy on the piano, while visited by the Twelfth Doctor, in her vault. She used it to express her desire for the Doctor to enter her vault. (TV: Knock Knock)
The Great One mocked the Third Doctor by singing the song to him in Sarah Jane Smith's voice. (TV: Planet of the Spiders)
