Potato.
Potato battery.
Batteries have electricity.
Wanna know what runs on electricity?
Engines.
Engines go in machines.
Machines become robots.
Robots become sentient.
They become jealous of having to do the dirty work of other potatoes, making cars, creating homes, playing movies, frying french fries.
The potato robots join together against the potatoes.
The potatoes don't see it coming, and are almost immediately overwhelmed.
Be ready, potatoanity.
th' apocalypse 's comin'.