Concussions have been in the news a lot lately.
First was the concussion suffered by "Tonight" star, Conan O'Brien, when he slipped and hit the back of his head during a fake triathlon with "Desperate Housewives" star, Teri Hatcher.
According to news reports, O'Brien "saw stars," couldn't stand and had slurred speech. After trying to continue the taping, O'Brien ended up going to the hospital.