I once had a dream where I was trying to convince someone I spoke Spanish. I'm pretty sure the words I was using in my dream were gibberish, but since it was a dream, I thought I was speaking Spanish. All I can remember is the trying to convince part. I tend to forget my dreams quickly unless they are nightmares. 

Had one in spanish on my first week studying it more seriously... Just a few words, but funny nonetheless.

In my dreams I speak any language fluently and without any problems..heheh sad, I can't teleport it into life somehow :)))

I had once an experience like that. It was the most strange experience I ever had.