You want to see heads explode?
Get an English car with right hand drive, and put your dog in the left hand seat.
Sort of a variation on this.
http://youtu.be/5FVdUqCxK8I
While in the USAF in the early 70’s my friend put a small steering wheel on his VW Bug.
I had a Dodge Colt w an adjustable steering wheel, which I dropped to the lowest position.
Steering w my knees, I held the old VW wheel in my hand as I approached the entrance to work and my buddy in the passenger seat.
Having caught the attention of coworkers, I lifted the loose steering wheel with a look of panic and handed it to my buddy, he faked panic for a second and handed it back to me.
Our coworkers scattered from the intersection.
That has to be my best all time prank.