Well, he's no Aaron Fotheringham, but...

This video is called "Extreme Crutching" (link is directly to video, with sound, so if you are Samuel and in your office, watch out). It's not quite "Hard Core Sitting", but it is pretty cool what this man can do with his crutches. (He has something called Legg-Calve-Perthes syndrome, which basically means his hip joints are completely and totally messed up. Apparently any type of impact on his legs (like walking, running, jumping, etc) is bad for him, which explains why he can do all the cool things he does and still need the crutches). Anyway, I thought it was really cool.