I'd really appreciate any interpretations of this, I'm quite perplexed.
I was wandering around in a vaguely college-type building with people milling about everywhere. I was with this girl I've been friends with forever (and have a bit of a crush on) and we stopped and sat in some chairs near a door. A kid I used to know (who in real life got really into LSD at a young age) showed up and started playing this sort of runic future-telling game with us. He was tossing tiles with runes onto the floor and reading my friend's future from them, and we were all laughing and enjoying it. I began to notice that he was picking her tiles up quickly and lying to her about what they said; he kept saying she'd gotten the sign for "Icelandic mushroom" over and over. I was still laid back and didn't think much of it, and eventually he wandered away. My friend and I kept chatting but soon she started to act funny, and I realized she was tripping. I was suddenly playing trip-sitter for her, holding her and telling her it was okay, just go with the flow of it... then I woke up.
I usually understand the underlying themes when psychedelics show up in my dreams, but this is the first time I've dreamt of someone else tripping.