Lady Gaga got a concussion yesterday during her concert in Auckland, New Zealand, after one of her dancers whacked her in the head with a pole (full video here). After it hit her she rubbed her head and stumbled around a bit, then briefly left the stage before finishing the show as if nothing happened.
Which I guess means she was able to slur her words for the next 90 minutes while bleeding from her ears and twitching and no one could tell the difference between that and her regular music. How flattering! If you're a performer that must be like the highest compliment you can get.