you don't so much see shit, it's more your inner essence gets fucked up which causes reality to be perceived differently.

for me, the first couple minutes was feeling like my soul was trying to be ripped from my body, then for about 5 minutes my soul was ripped out of my body and doing all kinds of crazy shit I couldn't describe, then after that my soul struggling to get back in my body. LSD and shrooms fucks with reality on the outside or so it appears, but salvia is a totally inner expierience.