A lune is a short poem of 11 words: 3 words in the first line, 5 words in the second line, and 3 words in the third line. Frequently, the third line offers a surprise. For more information about lunes, including examples, I recommend the book Poetry Everywhere by Jack Collum and Sheryl Noethe. I have the first edition. Here's the second:
And here's one that is best read along with the art:
Will you give Lunes a try? Since they're such a short form, I hope you'll share examples in the comments.