I saw this juvenile cooper at White Rock Lake. It had its back to me. I took a shot then thought I'd try to get it when it flew. Suddenly it whirled around and jumped into the air and flew right in my direction. I don't know which of us was more startled. It with this expression on its face or me when I nearly dropped my camera after this shot and gave in to my impulse to duck.
Juvenile Cooper's Hawk (Accipiter cooperii)