Car batteries are filled with acid and can give off hazardous hydrogen gas if mishandled.

FORBES: What To Do If Your Car Won't Start In Cold Weather

The rotation of the crankshaft imparts a rocking moment to the chassis, so that these bikes lean to the right when you give them the gas and go strangely neutral off-throttle.

WSJ: 2014 Moto Guzzi California 1400 Touring ABS Review: Ponch, Your Ride Is Here | Rumble Seat by Dan Neil

If they give off radio waves at all, the signal is lost in the mess of gas in the neighbourhood.

ECONOMIST: The dizziest, giddiest stars