I met a gentleman last night at a bar, who happened to be in a wheelchair. His arms seemed slightly hindered in their movement as well, but he could conversate just fine. Long and short of it, it turned out he had a wealth of knowledge of martial arts theory and application from his former training in wing-chun (I think he'd been hurt relatively recently, I gathered), and was able to articulately pick apart famous scenes and techniques from martial arts movies in a technical manner. Not much to note, just observing that it's really too bad the world didn't get to see him as a martial artist or even teacher, given his mental acuity in that regard.