A user by the name of F00 f00 has managed to successfully graft a full size PlayStation 2 controller to the rear end of his PSP.
"This mod has taken me 2 months to finish. It's been a love hate relasionship with the psp during that time. Theres been so many times I've wanted to throw it out my window and watch it sail 15 floors down. But with the suport of the R&D crew I finaly managed to get this thing finished."