Unfortunately I am serious -

"And Justice For All" and "Kill Em All" are two I would consider classic rock/metal. Admittedly I side with most folks on the BBS and consider their recent stuff to be a steaming pile of poo.

Also I tend to class Maiden, Deep Purple, Led Zep and a few others in the classic rock genre.

What would you class as classic rock? I think these meet the relevant criteria of:

Essential part of rock's history from which a great deal of modern music has developed.
Definitely more than 10 years old (okay this one is arbitrary)
Wide appeal (my mother likes the melody progressions in some early Metallica...oh hang on, she also likes some Yngwie...hmmm)