Alright, I have an idea that I think is kind of interesting. From what I know, it has not been done yet and I'm hoping it can grow into something that will be accepted on the site.
Basically, it's a bicycle that causes extreme visual and auditory hallucinations. When ridden for ten minutes, subjects begin to remember everything that had happened in their lives up until that point. Childhood memories, days spent with family, etc. When ridden for 20 minutes, subjects begin to see people or things that were a somewhat big part of their lives. For example, a family member walking down the street or their first car. When ridden for 40 minutes subjects believed they were at their childhood home, doing something that they had previously enjoyed doing.
Hopefully this idea could become something amazing and any suggestions I receive would help me greatly.