This will end well.
I can imagine a pre-credits sequence starting the other way around. Police called to a disturbance... find a big robot stomping towards them... and pan back to a little kid controlling it.
Pyramid magazine, back when it was on newsstands, had a mini GURPS setting called Sprockets, collected in the first Best Of book in which unique and inexplicable gadgets appear all over the Earth and people get to take them over pretty much at random, with hilarious/dangerous consequences. Like the Cubes in The Power Of Three. Or Santa Wants You Dead... Put them all in the hands of kids and stand well back.