What is the most ridiculous thing you've seen in Sci Fi?
Sci Fi is, by its very nature, something that is fantastical. It must be or it becomes mundane. However, you sometimes see people overstep the bounds. So, what Sci Fi stupidity have you seen?
For designers, think of the things listed here as warning against your more outrageous, drunken imaginations!
I'll start with one of my own errors...
Thinking planet
A mechanical moon that was created as a self-sustaining object, which gained sentience. It was an error because upon seeing it, my players thought it was too dangerous to have about and blew it up.