A "Chinese fire drill" is when people trick a random stranger into entering their car amidst a lot of commotion. There is a lot of noise and movement, and the victim is usually distracted. During the time they're in the car, they're actually pricked with a needle carrying blood tainted with H.I.V.
They are then let out of the car, their assault unbeknownst to them.
Then they sleep with everyone at a party, and everyone dies.
If the light turns green before the person is back in the car, the driver drives off. this gets especially amusing when someone locks the doors.