To be perfectly honest, I have NO idea what it's for or what LEGO set it's from. I bought it off BrickLink some time last year because I thought it was something I needed to have for this series! This scene popped into my head last year and the idea of it convinced me I had to do this this year!
If I come across what it's called or what set it's in/what it's used for, I'll let you know.