There was a BBS earlier on in Splinterz that got stuck like that after I'd posessed him. I eventually got him to stand up straight, since he was making MY back sore just looking at him...

Ah, I've had that happen before, the echoing sounds when you're out in the open?

I don't know if this goes here or not (Mods, move if need be) but I found out that you can take Eugenius one-third of the way to New Yolk City.

Hokay, when he opens the gate, knock him in (Chippunks don't lure him at all). Then make sure he's all the way in the gate and go in with him. If you do it right, the gate'll close before he can leave. Then it's just a matter of punching him through the cave (he won't walk by himself).

The trickiest part I've found was getting him over the logs and up on a ledge, but once he's on the log you just punch him up to the top. Boombats also come in handy, especially when you get to the waterfall upward path with the gaps. Well-placed Boombats act like rockets and send him flying across.
You can't take him all the way with you, because there's a rope you have to cross and he can't.

But it's kind of fun, mostly if you want to beat up those poor, stupid Clakkers. :D

the same thing happened to me but when I started shooting he got upright

I think that's how I got him to stand up straight, too. It only happened that one time, so I'm not entirely sure.

Edit: My 20th post and it only took a little over three years.