The humor in this meme might stem from the flipping of the digital numbers to represent letters, which ends up spelling 'Mazal Tov,' a Jewish phrase used to express congratulations or good luck. The intentional misspelling with a '4' and 'Z' instead of 'M' and 'S' resembles the style of writing sometimes seen in digital characters like on a calculator or digital clock, playing on the idea of digital typefaces where numbers can look like letters when viewed upside down or at certain angles.