Antigravity Machine

My brother built a potent antigravity machine.
It runs on electricity and hi-test gasoline.
He sat in it and and turned it on and shot up to the ceiling.
Which took him by surprise and has him clamoring and squealing.
He’s yelling like a maniac and pounding his device.
He’s calling it some epithets I’m certain aren’t nice.
I guess he should have given just a little more attention
to all the knobs and switches that he put on his invention.
Without a switch to turn it off, he’s stuck up there, alas,
until the batteries are dead and he runs out of gas.