Thanks to the Boston Globe, we can alter our perception simply by the use of ping pong balls and a little radio static. Now, before all of you acid droppers get all excited and uppity, the hallucinations generally consist of horses prancing through clouds or hearing the voice of dead relatives. Both creepy and awkward, I know. However, the guide is more useful than I made it out to be. There are other cool experiments such as making a laceration hurt less or tricking yourself into thinking your friend has just stabbed you in the hand (a lot more awesome than it sounds). Check out the Boston Globe article here.