My first LD was about twenty one years ago, I was a freshman in college (now I came back to this hobby after a long break this February). I don't remember any more what caused me to become lucid, but I know it was a DILD. It lasted only seconds, during which time I attempted to sumersault, but woke up instead. The thing that I remember most vividly though was that I felt an elevated adrenaline level throughout the day after that first lucid, a feeling I have not experienced since, I was so excited and energized and just euphoric. I have had much better lucid dreams, but I have never had as good an aftermath as after that first LD.