I decided to go with the notion that Mary has found out something, although Peter's reminiscing could be obscured easily enough. I wanted to come up with something involving Eustace and Dragons, but the actual peyote ceremonies, to the extent that I could read up on them in the last hour, did not sound like they would work for that. So this has less silly visual punch line. Perhaps Mary locates some peyote on her own later and she and Eustace try a larger dose? Bah. I have to go to work and be responsible.
-H