The origins of granny

I'd always thought I'd nicked it straight from the grandmother in Odon Von Hovath's 'Tales from the Vienna Woods' but on watching the I wonder if there was another earlier influence on my granny character.
How I love you tube.
Willo the Wisp - the potion
http://www.youtube.com/watch?v=oFKTeZ-tSGU&mode=related&search=