My friends smoked it a few years ago. They didn't have enough for me to hit it so I was the "sober one" that had to watch out for them. It doesn't last 15-20 seconds, it's more like 15-25 minutes but it seems like a lifetime. ALL of them saw this robot elf who spoke to them in this elvish language (but they understood it somehow) and it told them the secrets of hte universe but they forgot the secrets when they came back to "reality". They didn't all experience it exactly the same, but it was eerily similar for all of them. Only one kid out of the 5 had a different experience and he got sucked into a book.