When my sister was a toddler, I used to make her sing "Twinkle Twinkle Little Star", "Bah Bah Black Sheep" and "The ABC song" all in a row until she got confused and mixed up the words. I thought it was amusing.
I was just doing the USA Today Crossword and the Clue was:
69 Across: "Old Macdonald Had a Farm" refrain
So, I sing "Old Macdonald Had a Farm and Bingo was his name-o. B-I-N-G-O"
The answer must be "Bingo", right?
I combined two children's songs into one! "Old Macdonald Had a Farm" and "There Was a Farmer Who Had a Dog"