So nutty idea just popped into my brain: Ben Grimm, AKA the Thing (to be precise 60s comic thing) somehow gets sucked from his universe into the Avatar universe and runs across a certain blind girl with the oddest power to bend the Earth... And thus the greatest friendship in the mutiverse is born.
Toph: You know Aang, a friend of mine has this saying for situations like this.
Aang: And that is?'
Toph *grins devilishly*: IT's CLOBBERING TIME!
anyhow, just an idea that's been kicking around in my head. Will never get around to writing it but if someone else out there wants too...