A girl plays a harmonica by the window, you float over. She turns to you, smiles and says
"Don't tell my sister that I died"
She vanishes.
A lucid dream I had almost 10 years back. It stuck with me for many years and was what got me started in lucid dreaming and dream art (which now consists of most of my art practice).
A piece that I had started and failed multiple times, I could never get it right and had to give up due to my lack of skills. Feeling that the time is right, I challenged it once more and took my sweet time with it. It's finally complete.