Check out this article:
http://www.abcnews.go.com/US/wireStory?id=2846801 (http://www.abcnews.go.com/US/wireStory?id=2846801)
Seems that Chewy was touching people he shouldn't have...
(http://img249.imageshack.us/img249/6697/chewbaccaiq5.jpg) (http://imageshack.us)
I wonder if he made the wookie noise as he headbutted that guy?
(http://img249.imageshack.us/img249/3839/chewbaccahd0.jpg) (http://imageshack.us)
Tour guides dont rip peoples ARMS out from their sockets. Wookies are known to do that.