I love how mad the visuals get on acid, I remember it was like someone had a wheel with celophane that went through every colour around it and it was spinning around my head so the world was constantly bulging and fading yellow, blue, purple, etc.
And of course behind all that stuff's just going crazy.
The only proper hallucination I had where it looked so real I genuinely couldn't tell if it was actually there or I was just off my tits was streams of water gushing in between the brick floor tiles, and when I picked something up (idk if it was dog stuff or a snail or what) and it cracked through the middle and a bright orange light shone out of it and it started wriggling in my hand.