69 350 ragtop mentioned bubble wrap. When I worked a one GM dealership in the body shop we used to play games with the mechanics in the stalls next to us. We would take the bubble wrap new parts came in and wad it up and put it under the tires of the cars they worked on. As soon as they backed out it would make all kinds of noise and they would slam on the brakes to see what they ran over. Man those guys were crabby. They needed to sniff some more paint fumes.
Barry