Some memes(90%) can be offensive to some, racist, dark, etc. some may think though that memes like that are good for the world because it justifies or brings light to how many racist or offensive things are stupid, and how we shouldent get so worked up about them!
theres a lot of memes the first one ever made though was godwins law stating that :Godwin's law (or Godwin's rule of Hitler analogies) is an Internet adage which asserts that "As an online discussion grows longer, the probability of a comparison involving Hitler approaches 1"—that is, if an online discussion (regardless of topic or scope) goes on long enough, sooner or later someone will compare someone or something to Hitler
usally the most common memes though are rage comics, badly drawn characters with a story such soemtimes the characters are well drawn though, such as this one
credits: memebase.com, memecenter.com, wikapedia