What is the wildest thing you ever done?
What is the strangest/weirdest/wildest thing you have ever done? What do you wish to do?
What are your wildest sexual desires or fantasies? Which ones have you got fulfilled and how?  What are your wildest fantasies? What was the craziest thing you have done lately? What is the strangest thing you've ever done at school? What is the most pretentious thing you have ever done? What is the craziest thing someone has ever done? What is the craziest, wildest, most interesting or anyhow impressive thing you did out of boredom? What is the weirdest and incredible thing you have ever found? What is the craziest thing you have ever done for love? What is the strangest thing that has ever happened to you? What's the kindest thing you've ever done for anyone? What was weirdest thing you did today? What's the weirdest thing you did today? What are the craziest things you have ever done on your trips? What is the funniest thing you have ever done or seen someone to do? What is the kindest thing you have ever done for a stranger? What has been the scariest/creepiest/weirdest/craziest experience you've had at your job? What is the strangest thing that ever happened to you? What was the kindest thing you have ever done to someone? What's the craziest thing you have ever done to express your feelings? What's the funniest thing you have ever done to someone? What is the craziest thing you have ever done with a stranger? What is the most craziest thing that you have ever done for your loved ones? What is the kindest thing you have ever done for anyone, be it friends, family, or strangers? What's the funniest thing that you have ever done to someone? What is the strangest thing you own? What is the stupidest thing you've almost done? What is the weirdest thing that you have ever seen or have happened to you? What is the weirdest or funniest thing you have done as a child? What is the most tactless thing you have ever done?