I'm curious about your experience, do you actually feel like you are seeing green, or do you just know that green is the correct answer?

We had a bunch of different candies on the table at game night and I gave my friend some M&Ms, he thought they came from a bag of mint flavored M&Ms. He said, "wow I never tried these before, they really taste like mint." We all did a double take, he definitely did not eat mint M&Ms, I don't really remember if we even had mint M&Ms at the table. I believe him when he says he says he tasted mint though, like his brain placeboed the mint into place.