Twitter), or no more than six words (see the Six Word Memoir project). Here's a challenge from Dr. Seuss, a.k.a. Theodor Geisel, that I was intrigued to learn about at the Dr. Seuss exhibit, and that might be a little harder: Write a story using only 50 words, i.e. the same 50 words.
He, in fact, did just that: He bet his publisher $50 that he could write a story using no more than 50 words, and then he did it, writing his bestseller Green Eggs & Ham. Not only did he write it with 50 words, all the words have only one syllable, except for one: "anywhere." And all this in 1960.
Many of his books are based on a list of 220 beginner words, which makes them easy to read for children. Another secret: They are often written in anapestic tetrameter, a cadence easy to follow for young readers.
I loved these two insights into the craft of Dr. Seuss, and maybe one day I shall challenge myself to learn more about rhyme and rhythm, and consider the simplicity or complexity of the actual words I use.