Ben Carson was mocked Sunday on social media after posting a meme-style photo of himself for his birthday.

The photo has the words: "Keep Calm it's my birthday" printed on it, a play on the popular "Keep calm and carry on" images. Carson, a former GOP presidential candidate, used the hashtag "#keepcalm" to go along with the post.

Carson posted the photo both on Twitter and Facebook.

The photo drew quick responses, with several Twitter users making of the retired neurosurgeon and saying he doesn't quite understand memes.

tfw you don't quite get memes pic.twitter.com/rnqEDczFDT — Shoshana Weissmann (@senatorshoshana) September 18, 2016

Man i love ben carson https://t.co/kkGTOLGMJF — Gideon Resnick (@GideonResnick) September 18, 2016