What is the craziest thing you have ever done in your lifetime?
What is the craziest thing you have ever done? And why did you do it?
What is the craziest thing someone has ever done? What was the craziest thing you have done lately? What is the craziest thing you ever did on Quora? What is the craziest thing you have done on Quora? What is the craziest thing you've done in school? What is the most craziest thing that you have ever done for your loved ones? What is the craziest thing you have ever done for love? What are the craziest things you have ever done on your trips? What's the craziest thing you have ever done to express your feelings? What is the craziest thing you have ever done with a stranger? What is the craziest thing you have ever done with your friends? What is the craziest thing you have ever done in a lift? What's the craziest thing you have ever done on Minecraft? What's the craziest thing you've ever done on vacation? What is the craziest question anyone has ever asked you? What is the craziest thing you have done in college? What is the craziest thing that has ever happened to you at work? What has been the scariest/creepiest/weirdest/craziest experience you've had at your job? What is the craziest thing you have ever done to get someone?  What was the weirdest thing you have ever done in your office? What was the craziest dream that you've ever had? What is the craziest thing you've done in your college? What is the craziest thing you have ever done inside a lift? What is the craziest thing your partner have done for you? What is the craziest dream you've ever got? What's the craziest thing you've done for your partner? What was (for you) the craziest thing(s) you've done in your teens and early twenties? What is the stupidest thing you've almost done? What is craziest thing your girlfriend did for you? What is the craziest thing your girlfriend did for you?