Whack Some Weeds
While driving on an open country road most roadsides will have high weeds that are well overdue for a cut. If you drive close enough to the edge, you can actually reach out and touch them. Try this, get close at tell you buddy to reach out and pull some weeds. As he attempts this, speed up...If driving at a fast speed, it will actually hurt his hand.

Poo Under The Handle
Smear some dog poo under your victim's car door handle. When he goes to open his door, he will end up with dog poo all over his fingers.

Tailpipe Whisle
Drill a hole through the middle of a potato. Then jam a whistle in one end of the potatoe. Finally, shove that potatoe inside of your victim's car exhaust pipe. Make sure the whistle is facing the outside. When your victim starts the car up and drives off, he will keep hearing a whistle and wonder what is going on.

Damn Tractor Trailer!!
On your next road trip in which you drive though the countryside and pass a tractor trailer...try this prank. With your victim asleep in the passenger seat next to you, get behind the tractor trailer then brake hard and slowly speed up. Your victim will awake to a huge tractor trailer in his face...make sure you yell frantically while mixing in a few curse words...this will freak your victim out.

Hundred Of Post It Notes
While your victim is away from his or her car, post a bunch of those little post it notes all over. It is very frustrating and time consuming to take them all off.

Car Key Snap
Offer to wash your victim's car. But before doing so, go down to your local locksmith and buy a key that is similiar to his car key and snap it in half with pliers. Then replace his key with the fake key on his key ring. Tell him you are so sorry, but you accidentally snapped his key in half.

Not All Can Pull This One Off...
If you know how to re-wire cars electrical systems, then this prank is for you...While your victim is away from his car re-wire it so the low beam headlights are swapped with the highbeam, or try making it so everytime he steps on the brakes the car horn will go off. Be creative!

Open Tuna Can Prank
Place an open tuna can under your victim's car seat. It will take him a few days to figure out exactly where the horrible smell is coming from.

Sugar Around Gas Cap
Pour some sugar around your victim's gas cap. Drop a couple handfulls on the ground below, or anywhere else you want to leave a trail. The person will think someone poured sugar down their gas tank. In actuality, nothing is wrong and no harm was done. The worst that can happen is the victim will get a tune up in result, and the car will run better than before.

Broken Window Prank
Shatter a glass bottle and pour it around your victim's car door and inside his car as well. Then roll his window down and run screaming, to tell him something happened to his car.