Explain how my first LD happened?

Ok, I had my first lucid dream last summer and I've been wanting to know why and how I got that LD. I'll give you all the details. So, first thing I remember was I woke up early during REM sleep and I decided to listen to some binaural beats. I only listened to one and I couldn't sleep while listening to it so I just took my headphones off and went to sleep normally. The first thing I remember in the dream was being in a big beach all by myself. Ok, here comes the weird, funny part: I saw Peter Griffin from Family Guy running around being chased by some sort of big animal that I couldn't recognize. He started yelling to me "You're dreaming! Do a reality check!" over and over. So I looked at my fingers and they looked funny so I knew I was lucid dreaming then. I then spun around and the whole scene changed. I ended up in some random neighborhood I've never been in. I just walked down the street trying to take in the whole experience. There were a lot of cars on the road and I saw a lot of people mowing their lawns. I then wanted to try if I can teleport somewhere and I just thought of something random like a bathroom. I then ended up in it for some reason. And then I woke up. Since then, I've only had one other lucid dream and I still couldn't figure out how I got it. So can anyone explain to me how I got this lucid dream?

Well a dream character told you it was a dream, which is common for some people, and then you proceeded to do the obvious, a reality check. This is a DILD (dream induced lucid dream). It's probably the most common of all the techniques out there! :D

Yea but I still dont understand how its only happened once and never again. I guess it was a DILD but still dont know hy I was able to LD that time

When you first start attempting to lucid dream, they will come somewhat randomly based on your effort. There won't always be an obvious cause-and-effect every time. As you increase your practice, they will become less random and more consistent. So I can't say exactly why you had that first LD. Probably you were excited and had high motivation while it was still new. The question to ask is what have or haven't you been doing lately? If you stay on a regular practice of whichever technique you like, the LDs will come.

well, sometimes you have to pay attention to things when dreaming, you were told it was a dild by Jryeme, and in that dream you were told you were dreaming thus did a reality check, thats kinda a short cutt really :) usually in a dild, something so wierd happens, so Bizarre so *out there* that you become lucid because of the sheer wierdness of it, i had dilds like your self, but they are rare! i suppose your not familer that well with your dream signs.

My first LD wasn't even intentional and it happened before I really knew what LDs were. I was being attacked by a pack of red wolves with my friend, and he said "This must be a dream!", I then thought, "Of course!" and I began to lucid dream. I think if you get lucky, if something in the dream is so out of place, and you are aware enough, you can get a DILD.