Getaway Car Question

FH has a Cobra Mustang that is in mint condition. It's garage kept and is his baby. It has only seen rain a few times. I want to use it for our getaway car and put "Just Married" on the back. He was completely fine with the idea until he talked to his parents about it. They said since we will be drinking they don't think it's a good idea. I told him I don't plan on getting wasted and he said he doesn't either but he also wants to make sure nothing happens to his car. I wanted to use it as part of my "Something Blue" since its sonic blue. What is everyone else doing after they leave the reception? Our hotel we are staying at after the reception is about 10-15 minutes away. I need some opinions please....