White Elephant Gifts

At what age should kids take part in an white elephant gift exchange?  We took part in one this evening, and while it was fun, there is always someone that gets hurt.  I hate for someone to be hurt, but it is even worse when my own child causes the hurt.  It doesn't matter that when the hurt child stole the gift, it was from my child, and hurt her.  It still is hard to see a hurt child...  I have to say though, that it was way cool to see the teenage kids taking crappy gifts from the little kids, so that the little kids could get something better!