Note to self - punch a wall instead

Message to all you kids out there, from ESPN.com

Brian Roberts knocked himself out of the Baltimore Orioles' lineup. Literally.

The veteran second baseman explained Monday that he missed the last six games of the season for concussion-like symptoms after hitting himself in the helmet with a bat.

"In frustration [after a strikeout], I whacked myself on the head with my bat in the ninth. I had my helmet on," Roberts told reporters. "It's something I've done a million times, but I still can't tell you for sure if that was it. But that's the only thing that I can point to because that night and the next morning, I just didn't feel good. So it's been going on since then."

"I just have some lack of balance and some headaches, and just stuff that hasn't been a whole lot of fun," Roberts said. "It's a lesson to myself, a lesson to the kids to not do that, no matter how frustrated you are."