What's the MOST fucked up you've ever been on drugs?

I once had a nice time on a cross between mescaline and psilocybin. The house I was in had no corners. Everything was one fluid curve. I later figured out that I'd been drinking the hallucinogens of the wrong culture. What's the funniest, most disturbing, trippiest, or craziest story you have where you were MOST fucked up on drugs? What drug did you take?