[Marty and Doc observe Georges incompetence in 1955]Dr. Emmett Brown: Which ones your pop?Marty McFly: [points him out] Thats him.[they see him getting kicked around by other school bullies]George McFly: [has a kick me sign on his back] Okay. Okay, you guys. Ah-ha-ha-ha. Very funny. You guys are being real mature.Dr. Emmett Brown: Maybe you were adopted.