I don't know about putting things in the car that cause a foul oder, because some things will stay with the car and won't come out. For example, I got some water in my car after hail knocked out my windows, and now I have to do a full carpet swap because the smell won't come out.
Wrapping his car in lots of plastic wrap seems pretty funny. I would just go with things that won't damage the car.
Every few months at work we get each other by drawing and writing funny things on someone's windows with a grease pencil (the kind they use at tracks). Doesn't leave a stain unless you leave it on for days, and it's really funny.
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