Alcohol, coffee, THC, MDMA, in that order. I consume alcohol and coffee almost every day, THC every couple of weeks, and MDMA like once a year.
Love is great, too, but as a Bernd, I can only get it rarely. It feels great, but also really like a drug: my ability to focus was seriously impaired and I went a little crazy, my mind was "occupied" - fortunately, I could keep the resulting weirdness mostly to myself.