This actually happened a while ago and was an extremely strange experience. Essentially what happened was that I was in a LD but knew that the dream was starting to fade. I began to spin like every good Ld'er should but woke up as I was spinning.

The trippy thing was that I actually woke up but my mind was still spinning. So that hallucination that I had in my dream of the spinning was incorporated into my actual waking state and I was spinning in my bed while slowly coming back into my body.

Weird.