*EDIT* Looks like JS beat me to it
Right hand mouse click on the node, and press: Select objects with material assigned.
I don't have Maya open so I can't check for the exact wording, but you should be able to tell.
"Your weapons are no match for ours! People of Mars, surrender!"
"Um, this isn't Mars. This is Earth."
"Earth? Earth-with-nuclear-weapons Earth?"
[long pause] "Friend!!"