The mixing of the following two drugs: Diphenhydramine (Antihistamine commonly known of as Benadryl, and when taken in high dosages can be a powerful deliriant) and MDMA, the drug commonly known as Ecstasy. Is known to create extremely interesting effects on the mind. Sometimes can be unnerving.
Don't recommend trying this unless you are interested in the experience. First try DPH (Diphenhydramine - Note, this isn't a fun drug to most) and MDMA (Ecstasy) separately if you haven't already.
Psychonaut 1: Hey man, have you tried Nightmare Flipping?
Psychonaut 2: Nah man what combo is that?
Psychonaut 1: It's a mixture of that deliriant Diphenhydramine and of course, Ecstasy.
Psychonaut 2: Woah, I never thought of trying that, sounds interesting!