Need Help to Answer Question

I don't expect a very helpful answer to this question, here it is:

For the longest time I have been trying to figure out which show this particular episode is from. I'm pretty sure it's a "Tales from the Dark Side", 80's or 90's kind of show, but I'm not sure. I don't know the title of the episode, but I can describe it. A family is sitting around in their living room and the children are talking to their parents about a myth that they heard, that if you sing this rhyme with this creatures name in it, it will anger him and he will appear. The parents dismiss their fears by singing the song in hopes of disproving their children, however shortly after they finish the rhyme, the demonic being does appear, and it's rather large and frightening looking.

Any help would be much appreciated, it's been eating away at me for quite some time.