Opiates are not equivalent to LSD.
Robitussin and Skittles make you trip?
I doubt it, unless something is making your body shut down.
The kid could prolly hallucinate by wrapping a plastic bag over his head.
What does this have to do with Zimmermans self defense?
Yes, very much so. At doses much higher than medically recommended, dextromethorphan is classified as a dissociative hallucinogen.