Accidental No-Fault (of mine) Ornament-Breaking

I went with a group of friends the other night to the apartment of a friend of ours, to give her apartment that special Christmas ambiance. (We put up the tree.) Whilst we were in the midst of decorating the tree, my friend was making me laugh. An ornament broke. (Sorry, C.) I guess it was my fault; I threw it. But I honestly did not expect that it would break. You know, though, I wouldn't have thrown it in the first place if my friend hadn't been making me laugh so hard. I don't want to blame the thing on her, but I do.