Two, actually. Benadryl and n-bomes.
I took 25-30 Benadryl my first time, 25mg each. I recited the alphabet for no reason, saw extremely realistic spiders and beetles exploding on the walls and window blinds, and I tried to hand a lit cigarette to an arm reaching through my wall. Worst of all I felt like an actual wooden board. Moving was next to impossible. I was also very twitchy.
I did a single tab of n-bomes. I was in a dark room and I could feel this weird pressure just pulsing, then suddenly felt like I was spiraling down, spinning really fast. I forgot how my doorknob functioned and spent 2 hours trying to get out of my room. I had locked myself in and began panicking, finally figured it out and got the door open, and thats when I saw the entire room flipped 180° like a funhouse mirror effect at a carnival. Astounded, frightened, and tickled by this I shut the door only to lock myself back in. Rode out the rest of my trip and felt anxious.
TL;DR stick to shrooms