Everyone knows that it's not a smart idea to upset a Wookiee, but we get to see Chewbacca in action when he tears off the arms of a Pyke Syndicate guard on Kessel. We are first made aware of this behavior in the original Star Wars: Episode IV — A New Hope when C-3PO is beating Chewie in a game of Dejarik (space chess) and Han and C-3PO have the following exchange:
Han: "Let him have it. It's not wise to upset a Wookiee."
C-3PO: "But sir, nobody worries about upsetting a droid."
Han: "That's 'cause a droid don't pull people's arms out of their sockets when they lose. Wookiees are known to do that."