If you say two sentences that rhyme, make a wish, then if you make a rhyme unintentionally and wish before you speak again, your wish will come to pass.
Baldwinsville, N. Y.

If you say two sentences that rhyme, make a wish, then if you make a rhyme unintentionally and wish before you speak again, your wish will come to pass.
Source: Current Superstitions (1896), entry 454.
Fanny D. Bergen, editor.
Modern normalized navigation; the historical attribution above remains unchanged.