10. Human Batteries Are Completely Inefficient - The Matrix
For a brief period in 1999 everyone thought trench coats were incredibly cool and that our world wasn't real. The Matrix's most enduring legacy may be the popularisation of bullet time, which quickly became tired after every movie in the early-naughties parodied it, but it offered more than relentlessly creative action.
Set in the distant future where humans have lost a war with machines and have been turned into batteries, farmed for energy and deceived by a complex computer program to think they're actually in the late-20th Century, The Matrix gave audiences a unique story that, while utterly bonkers, felt logically grounded. Now, The Wachowski's have stated the whole human battery concept was merely a plot device to get the Matrix up and running, but that shouldn't distract from the fact that the idea doesn't make any sense.
Most of the energy humans take in goes into keeping us alive, with the little waste expelled as heat. This should make it clear that, even in a totally vegetive state, a human wouldn't be a viable energy source. In fact (and sorry for going sciency), using the Second Law of Thermodynamics at best the machines could only ever get out the same as what they put in. They'd have been best wiping humans out and dealing with that scorched sky.
The original draft of the script had humans used as part of a neural network, with their brains adding more computing power, rather than as a source of energy, which would have made a little more sense (if being a little complex by 1999 standards).