1. Keep Your Hands to Yourself!
No matter how cool or awesome the cars are at the show, it is extremely bad form to touch a vehicle without an invite from the owner. This is the number one thing to not do at a car show, and you will violate one of the core, unwritten rules of auto shows if you do whether on purpose or not. This also means that you should take care to not let your jacket touch a car while walking around, and to be very careful of the zippers on your jacket if it is unzipped, since these are common causes of scratches on cars at car shows. Car owners respect those who follow the rules, and you will likely find yourself invited to take a closer look if you are a respectful car enthusiast.