If you ever have trouble with Meme ideas, get a joke book that was published between 1930 and 1980. Pretty much ignore ethnic jokes, but there are jokes in there so old that most people alive today have not heard them, or, if they had, it's been years/decades. You may have to make them a bit more contemporary, but updating a joke is common practice. I've used the Old Farmers Almanac for some of my memes.