There are only a select few buddies that I will let under the hood of my car and usually it ends up beng and instant "golden" fix moment for whatever is ailing the beast.
Although just the other day my Dad saw my car for the first time ever and the first thing he did was set his glass of soda on the fender.
It's not a good feeling to have to scold Dad especially when you have not seen him for a few years.