Grand Theft Auto: San Andreas/Highjack

After the cutscenes (which reveal the mystery caller to be Mike Toreno), get on the bike with Cesar, and drive to the truck. Now for the tricky bit. You must drive close to the door to the cab of the truck, whilst maintaining the same speed as it. When you are in the right position, Cesar will turn to face the truck. You must maintain this position for about 5 seconds, then Cesar will jump onto the truck, and take out the driver. After this, get into the cab of the truck, and drive it back to your garage in Doherty, San Fierro, to complete the mission.

Rewards

 * Cash: $7,000