This joke is funny because "Type O" (a type of blood) is phonetically similar to "typo" (a typographical error), and the word "rabbit" is just one letter difference from the word "rabbi". Note: A priest, pastor, and 𝒓𝒂𝒃𝒃𝒊 walking into places is a common joke format. #Typos https://t.co/k9eEFU7uIT
— Explainer of Jokes (@JokesExplainer) Oct 11, 2022