His high school picture!
He's one of those actors that's been bald so long that I just can't imagine him with hair. But he had it!
http://images-cdn.moviepilot.com/images/c_fill,h_900,w_1200/t_mp_quality/fqvriyl6sibwtu0ecvno/yearbook-photos-of-the-main-characters-from-the-terminator-franchise-are-fascinating-485385.jpg