Zimmerman's own foul ball bops him in back

Line drives and high fastballs may be the primary reasons for helmets, but don't discount the idea of baseballs plotting their own revenge, either.

With the Washington Nationals facing the Atlanta Braves in the eighth inning Friday, Ryan Zimmerman sent a foul ball sailing backward into the netting at Turner Field and, understandably, thought he was safe.

Zimmerman may never let his guard down again, however, as the ball bounced back off the netting before finding the first baseman and hitting him right between the shoulder blades.

They only strike when you least expect it.

(Video: MLB.com)