What is the least spoken language in the world? Dad Jokes What is the least spoken language in the world? Sign language. 👍 Upvotes: 3 More Dad Jokes Why did the cookie cry? You see, mountains aren’t just funny. Can February march? What are the strongest days of the week? What kind of tree fits in your hand? I started a new business making yachts in my attic this year… See all Dad Jokes →