Hood
I had just helped a friend get his 56 Chevy running and he wanted to see what it would do. So we drove on down the street and got on the access road to the highway and he punched it. It hooked hard and then it got dark as the hood popped open and all you could see is purple hood. This was in 1970 so there were plenty of parts available, so it wasn't too bad. Luckily it didn't break the windshield. Always checked my own hood after that, and if it is raced it going to be pinned.