Interested in coming up with your own personal psychedelic cocktail? There are books that will teach you how to whip up your own concoction in the comfort of your home. Written by the godfather of Ecstasy.
Results will vary and any prison/death/lifelong embarrassment -related outcome may ensue.
While on the topic of ingestible material, there are some food that should also be categorised as dangerous/controlled substance. If you are what you eat, why would you eat these?
It's okay, I don't need to prove mine is bigger than yours.
However, if consuming questionable materials/chemical/food in the chase of that adrenaline rush doesn't do it for you, why not try blowing things up to exercise your creativity? Marvelously, there are books that will teach you how to create your own IED without stepping out of your house. For the aspiring Unabombers out there, check out this page in Amazon.com.