take a dump in his trunk

 

the vasoline thing is dangerous, dont do that. that could cause serious problems.

shrink rapping axles is funny also. gets a nice burning smell and takes a lot of patience to get it off

 

look if you want to do a funny but harmless prank, put vasoline underneath the car door handle so when he reaches in it will get all over his fingers...

 

I could have sworn the sensor was in the front not the rear of the car on the newer cars.

 

I dont know if i am missing something, but What Sensor?

 

The sensor that tells the electric odometer that the car is moving. I forget where I heard it but I think it was an automotive teacher or something like that. He said that the sensor is usually on the wheels that don't recieve engine power so that any extra tire spin(burn outs, ice, snow) don't count for actual milage. If that is true than if the OP puts his friends car on jackstands and lets the thing run for a few hours all he'll do is waste gas not put miles on the car.

 

Ok, I understand what you are saying but I think it may be incorrect otherwise your speedometer would not climb when you did a butnout.

 

The speedo is mechanical, the odometer is electric. The two aren't directly connected. If the tire turns a certain amount of times then thats how they can calculate distance it yhas gone, the speed the car is going is irrelavent it doesn't matter if you're going 100mph or 15 mph, 10 miles is 10 miles.

 

That's a good one. I have done that. I also like taking stick on wheel weights and throwing a wheel or four out of balance.

 

wow...ive gotten a lot of good ideas haha. thnks guys never knew there could be such good pranks haha.