Sam and John were out cutting wood, and John cut his arm off. Sam wrapped the arm in a plastic bag and took it and John to a surgeon.
The surgeon said: "You are in luck! I am an expert at reattaching limbs! Come back in four hours."
So Sam came back in four hours and the surgeon said: "I got done faster than I expected to. John is down at the local pub."
Sam went to the pub and saw John throwing darts.
A few weeks later, Sam and John were out again, and John cut his leg off. Sam put the leg in a plastic bag and took it and John back to the surgeon.
The surgeon said: "Legs are a little tougher - come back in six hours." Sam returned in six hours and the surgeon said: "I finished early - John is down at the soccer field."
Sam went to the soccer field and there was John, kicking goals.
A few weeks later, John had a terrible accident and cut his head off. Sam put the head in a plastic bag and took it and the rest of John to the surgeon.
The surgeon said: "Gee, heads are really tough. Come back in twelve hours."
So Sam returned in twelve hours and the surgeon said, "I am sorry, John died."
Sam said: "I understand - heads are tough." The surgeon said: "Oh, no! The surgery went fine! John suffocated in that plastic bag!"