Huh? This is a first to me. You want to put yourself into stressful situations so that you will stutter more; kind of like exposure therapy for people with phobias……….? But you are not looking for advice on how to actually improve your fluency? I guess you could do something like volunteer for stuff in drama clubs that put on plays in front of large groups of people, maybe join debate teams? I personally stutter a lot approaching an attractive member of the opposite sex