It's easier to fall when your unaware.
My first time I went out to test the feel of the clipless pedals out to some hills nearby, then when i came back in my garage i stopped, forgetting i had them on.
My 2nd time was with my friend, when we both reached a stop sign, and we waited for cars to clear, but the cars weren't clearing and i was rolling a little too fast so i had to brake right away. I fell.
The third time was a disappointment, it was 5 months after i got them. One of my friends told me to drop by her and her other friend at a Library so i did and they came out and rushed toward me, they were in my way so i had to clip out very fast, which was successful, but i leaned the other way and fell.
I still believe I'm going to fall over again...especially in windy conditions.