RAW's Cosmic Trigger and Prometheus Rising for me: I read both when I was 13 and was a recently-converted Southern Baptist. I quickly shifted my entire understanding of epistemology and the nature of reality.

Wilson's "Everything is Under Control" was another important one for me after the Illuminatus! Trilogy. That's what sent me down the path into Thomas Pynchon, Hakim Bey, Noam Chomsky, etc. Can't really turn back after that.

Fnord!

And with your accumulated downvotes, it makes the Fnord appropriately difficult to see, unless you take conscious steps to see it.

Hail Eris!

All hail Discordia!