I hate say it as I do not believe in hurting people that I do not have too, but next time you two are lifting something and he makes even a slight bobble, drop your end. By accident of course.It's a cabinet shop. Most days I don't have to work with him. It's only when we have to go on deliveries together that the problems really arise. We lost our delivery driver, and I'm the only other person in the shop that can handle the truck/trailer. He's the only other person in the shop physically capable of picking up and carrying the necessary weight.
Frankly, I wish he'd just go ahead and hurt himself badly enough that he can't work for awhile.