All of this has happened before and will happen again. You start out to build a cute little robot coffeemaker, and next thing you know, you're up to your ass in berserk killer cylons.
I was thinking Daleks. After filling everyone up with coffee they'll scoot around chanting "Eliminate! Eliminate!"
Subjugation through Caffeination.
This is a Dalek plot that could easily have worked
. They get us all caffiened up, then, once humanity is hooked... switch us (secrety) to decaf. No one would have the energy
to fight back.