What is the funniest thing you have ever heard/seen?
What is the funniest thing/story you've ever heard?
What's the funniest thing you've heard yourself saying? What is the funniest thing you ever said? What is the funniest thing anyone has ever said to you? What is the funniest thing you have ever seen someone do? What are some of the funniest books you've ever read? What is the funniest thing you've ever heard a kid say? What is the funniest thing you've ever heard a child say? What is the funniest book that you have read ever? What is the funniest book you have ever read? What are the funniest books that you have read? What's the funniest book? What's the funniest thing that you have ever done to someone? What's the funniest thing you have ever done to someone? What's the funniest fiction book you've ever read? What's the funniest movie ever made? What is the funniest thing you ever said to your family? What was the funniest novel which you've read? What is the funniest, most entertaining book you've read? What is the funniest thing you have ever done high? What is the funniest name you have ever heard? What is the funniest experience you had today? What is the funniest thing your child ever did? What are some of the funniest movies? What's the funniest conversation you've overheard in public? What are some of the funniest things your kids have said? What are some of the funniest names ever heard? What is the funniest thing a comedian has ever said? What are the funniest stories your family and friends tell about you? What is the funniest thing your kid has said? What is the funniest movie to watch?