I know what you mean about turkeys being sweet and smart... Although about some things not so smart: my Rhonda got exited about dinner time when I walked through the gate last week, and so instead of walking around the pond she decided to fly over it. I guess no-one old her that turkeys can't really fly. And they can't swim, either, so I had to fish a very wet very flustered turkey out of the pond. (Needless to say, the adventure did nothing to dampen her appetite!)
I've heard her make a lot of very odd sounds -- quite a few of which sound like she's swallowed an old rotary dial phone -- but her threat/warning noise I can't describe. Definitely odd.