One time when we were tripping on acid, one guy found a blade a grass that he claimed was changing colors. A bunch of the other guys gathered around and they were all laying there in a circle on their stomachs looking at it, trying to figure out if it was actually changing colors or if they were just tripping.
They were being ridiculous so I was just laying there staring at the clouds laughing while listening to them debating it.
The best part was that after about 10 minutes, they concluded that it must actually be changing colors.