Up Up And Away

I'm due to have gallstones removed in September. The other day, in the supermarket carpark, I met an acquaintance and we got talking about our respective health. I told him about my impending operation. His response? "The first cousin's daughter, only a young wan, had that keyhole surgery and it nearly blew her up. They filled her with some sort of gas to make room for the instruments and, I swear to God, she went up like a balloon... right up to the shoulders. She was like the Michelin Man...."

Thanks Joe (name changed to protect the guilty).