Looking for a movie I saw as a kid which scared the bageebuz out of me. I think it was black and white. Story is:
This flying saucer lands in a park but has the ability to be invisible. These 2 kids, boy & girl, are walking around the park. The aliens see them (they look like us, not creepy aliens) and make the ship visible. The 2 kids are "hey, looky there, there's a flying saucer, let's find the door and look inside". They are greeted by two aliens (men I think) and they are nice enough, "hey, come inside, look around, check this out, hey kids want some candy".
So the kids are checking out the spaceship, and they start asking questions. The aliens are "sure, we’ll tell you all about our technology, here, work on these difficult math equations..." Meanwhile the ship has turned invisible. The longer the kids are gone, the parents wonder. So the kids are learning a lot but soon it's dinnertime and the kids have got to go: "ok open the door, we gotta go home". But the aliens say, "well sorry kids, you've already learned too much, your kind can't handle the things you've learned, so you gotta stay with us".
So they get locked in a cell for the night. The parents are freaking out and a search begins of the park. So the kids spend some time aboard the flying saucer with the really nice aliens. During the day they learn calculus, algebra, trig, and alien technology (somehow the aliens make it really fun to learn). Eventually the kids start to wonder what the alien agenda is and ask their hosts when they can go home, and without a good straight answer they become suspicious. By now the search has escalated to dynamic proportions.
The kids hear the aliens talking and the gist is, the reason the aliens are teaching them so much is because where they are from children’s brains are a delicacy and the more knowledge they can shove in there the better they taste. "Oh no they want to eat our brains." So the children stop learning anything and try to be more dumb (so they won't taste so good). Eventually they dicover a mass in the park national guard shows up. They beat on the door, "we know you're in there, open up", and the kids escape. Happy ending: the aliens are like "you're not ready for our technology" and take off. The end.
Been wondering about this for a while. I was glued to the TV when I saw it as a kid. It has scared me for life; I can never forget this movie.