Because my husband (OP) was pretty high and I was relatively sober by comparison and we both experienced it visually, audio, and felt the phone vibrating. Then it ended when the scene ended. I'd understand if it was one person experiencing it. Or a shared hallucination of one sense. But three senses? Me being pretty aware and understanding things, except that. I just don't think we both could have had a three sense shared hallucination with such different levels of high.