I had a very odd trip once after eating some 'herbal incense'. It was around three years ago when there weren't so many varieties of the stuff here.
I ate a bit and headed out at to national gallery and then lunch at a Japanese restaurant after. Then a wander around Melbourne Central shopping centre because my girlfriend wanted to buy something.
At the gallery I felt mildly, and not unpleasantly, affected. It wasn't really like weed. Actually it wasn't really like anything else I'd tried. I had the distinct impression that there was water on the floor and we were ankle deep in it. Vision was slightly altered but I couldn't define exactly what was different. Mentally I felt pretty normal.
Then at lunch, I was chewing on a piece of sushi and BOOM it all hit, in less than a second I went from being slightly affected to being completely smashed. This was around three and a half hours after consumption. The food tasted strange and alien, my heart raced, I couldn't stop fidgeting, I felt a bit nervous, and simple sounds became strange and confusing. Walking around in the shopping centre I was bombarded with memories of walking through those same places with high school friends when I was a teenager. I grew up in Melbourne, so I've been to Melbourne Central and Myer since I was a little kid. I could see the place as it was when I was a teenager, rather than in its current state, as if my memory had become so clear that it had projected itself outwards. A flood of memories hit me; not special moments or anything, just mundane details that I couldn't believe were still in my memory banks. So clear.
Then I realised that I knew the person on the escalator in front of me. I knew the face but had forgotten the name and where I'd met her. Then I saw that I knew the person behind me too, but again, couldn't remember from where. Then, upon getting off the escalator at the top, I saw that the whole place was full of people I had known. They were all so familiar like I'd known them closely, but I couldn't make the connection of where/who... Of course I didn't really know any of them, but the the facial recognition part of my brain was in overdrive and despite knowing that it was logically impossible, I couldn't shake the feeling and stop staring at everyone.
It's the only time I ever had that experience on any substance. It was very disorienting but not really stressful or bad. Just weird.