A multi-tasking British jogger has become the first known victim of a jolting "twinjury"—an injury sustained while using Twitter. A 23-year-old office worker was attempting to Tweet an update on his Blackberry while running to work and cracked his head on a low-lying branch. His response? "Running to work, very late. Smacked my face against a branch, hurts. Forgot how tall I am. Danger of Twittering," he Tweeted.