I remember the first time I got truely, undoubtedly high.
Me and a buddy were on the way to a Primus show. He had failed to pick up the shrooms as expected, so we sat in the parking lot while he rolled the blunt. As he drove, I opened up all the windows & the sunroof, and blasted a live Radiohead CD.
Halfway through, I saw a yellow "yield" stop sign reflected on the wet surface of the road, and I swore that it looked just like a huge, yellow shaggy dog sitting in the road, smiling at me. I started busting out laughing, and didn't stop for another ten minutes. Attempts to discover the source of my amusement by my friend were to no avail, because how do you explain that shit?
Anyway, Primus was great, we got in for free, and I have the same Radiohead CD now. I'm gonna try shrooms or acid soon.