Last night, a bunch of friends and I dropped acid somewhere between 4:00 and 5:00. In about an hour, everyone else started tripping, but I only felt the pot we were smoking. For their entire peak, I felt normal. So I gave up and went home to munch on some shrooms and smoke a bowl. But on the way home, I realized there was more than just pot affecting me. I was hallucinating while still eating the shrooms, so it must have been the acid at least then. Why would this happen? Every time I've dropped, I've tripped in a timely manner.
Maybe it was a really low dose. Not all blotters are equal on a sheet...and that time you were hallucinating was the peak of the experience...