So far, Jeffy's lost his brain, his helmet, his shirt, his arms (as a bet), one of his legs (twice), his eyeball (as an unintentional gag), his eyesight, his ear, his teeth, his voice, his groin pelvis, his diaper, his shoes, his hand (not really...) and his pencil...
I swear, he'd lose his head if it weren't attached to his body. Oh, wait... What's next?!