I remember seeing that movie on tv when I was around 9 or 10, scared the daylights out of me! Haven't been able to bring myself to watch it again, since. I think I might do better watching the Monster that Ate Mars.
I can remember being terrified as a child after seeing the previews at the drive-in. Powerful for its time.
Still remember the tagline: "The Blob! It eats you ALIVE!"
I flipped over there just to see Helen as a teenager. Pretty weird!