I think that must be right.
I'll try this one. It seems a bit ridiculous, but it is getable, if a tad contrived.
There was once a rather gay lady, who was trying to learn to sing, she had her scales perfect, except she could never got the 4th note of the tonic scale in tune. Then she found a new teacher who taught her the correct breathing, which enabled her to sing the note in tune and she lived happily ever after.