I have experienced this once before, not the high from E, but still a contact high...Thanksgiving of this past year...party at a co-workers house where most of us were rolling, some MDA pills so kinda trippy-rolling...me and two of my buddies went into room to do some whippits. I sat on the bed with my one friend, the other friend sat in a chair across from us...The friend in the chair went first, blew the whole charger, and in about 7 seconds, both me and my friend on the bed got a bizzarre headrush, similar to nitrous but had some weird flash to a salvia-like state for just a second or two. We both snapped out of it and based on the looks on both of our faces, we realized that we both had felt it, same description of the feeling and all, it was crazy, I had heard the term before but never had anything even close to it happen before...
Pretty damn cool if you ask me, makes you wonder what goes on between ourselves and others that we don't even know is happening.