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 What do you call a nervous javelin thrower? What kind of shoes does a thief wear? Why is Peter Pan always flying? Why do trees seem suspicious on sunny days? How do you tell the difference between a crocodile and an alligator? Did you hear about the hungry clock? See all Dad Jokes →