Bloke starts a new job looking after a chipping machine in a potato processing plant. The gaffer tells him that it often jams but he must never put his arm in to free it.

Of course on the first day it jams and he sticks his arm in to free it with subsequent loss of limb. His co-workers pack the arm in a plastic bag and rush him to the hospital. Next day, arm stitched back on, he is in work bright and early. The manager reminds him that he must never put his arm in so when it next jams he tries freeing the blades by stamping on the blockage.

Surprise, surprise. He loses his leg. As before, his work mates pack the leg in ice in a plastic bag and rush him to hospital again. Next morning he astounds everyone by waltzing in as if nothing had happened. The gaffer, getting a bit wiser, tells him to never put a limb in the machine. At the next jam he heeds the advice and tries to headbutt the blockage to force it through. Well, as you can imagine, he is decapitated so his pals put his head on ice in a plastic bag and take him to hospital.

The next day he doesn't turn up so the boss nips round to the hospital to find that the poor chap had suffocated...