His “perfect sequels don’t exist” meme, featuring screengrabs of “Hat” and “Hat 2” was a tremendous hit on the dank memes subreddit, turning O’Kelly into a meme sensation overnight.

For the last two weeks or so, people on Twitter, Reddit, and Tumblr have been adding cowboy hats to pictures. Alas, this nascent cowboy-hat meme — a.k.a. the “What in Tarnation” meme — is ...