Anyone have any nominees? Here is mine:
In “The Black Hole” (which I would nominate as the dumbest movie ever, period), there is a scene where they get too close to the black hole, and they are in a big glass ship (smart!), some debris shatters the glass (duh), and of course everything rushes out into the vacuum of space. Including the beloved robot. So, the humans hold onto the heavy metal robot to prevent him from being sucked out. I can only assume they had superglue on their shoes.
In another scene they run over a melting bridge without even getting their eyebrows singed, but I digress.