I've seen so many that have given me a good laugh, I don't know that I can pick out one. I've made a few tailored to situations, or to the personalities of friends and family. One I took real delight in:
We have a little great niece with coffee-with-cream skin tone, 'cause her daddy's from Camaroon. Her first birthday was just few days after the presidential election. I made a simple stars-and-stripes pattern around the words, "I could be PRESIDENT some day". It felt so good to know that it wasn't a tasteless joke .
                            Dean