I remember the smurf hysteria of the 80s as well. One of my favorites was that if you tried to burn a picture of a smurf, it wouldn't burn.
I was a small child then, but I remember my "worldly" cousin mocking me about it. He burned one right in front of me to make a point.
It's been so long ago and I was so litle that I don't remember much of anything else about that story, but I was easily suckered in by all the supposed demonism stories back then.