Like many other posters, I saw this film as a young boy and it gave me nightmares for weeks (maybe even months)! Luckily, my older brother finally convinced me that the "liquid creature" would not survive a swim from Japan to the United States and I was able to sleep again.

I suspect that the modern age's Freddies, Jasons and Leatherfaces would not hold a candle to the effect that this film had on an impressionable youth back then. Perhaps the very fact that the monster had no tangible qualities and could theoretically be any puddle of water you came across was what gave it its fright value.

It would certainly be interesting to see how a remake of this would play today.