Antimatter cannot be the perfect opposite of matter, otherwise neither would exist at all.

ECONOMIST: Fundamental physics

Those deep water rigs use an enormous amount of diesel fuel to turn the drill bit, and also resist the force that is turning the drill bit and would otherwise force the platform to start turning in the opposite direction.

FORBES: Petroleum Balance

Lower population than otherwise means fewer members of Congress from the state and fewer electoral votes in Presidential elections, while the opposite holds true for more population.

FORBES: Bobby Jindal Seeks Rich State Status With Income Tax Phaseout