Old people and seafood (joke)

Tell the story of an old man who ate 30 Jin of seafood until he couldn't walk. One day, the old man walked into a five-star restaurant and bought 30 kilograms of seafood. At this time, he cooked seafood and then ate it slowly, for ten minutes, twenty minutes, thirty minutes and forty minutes. Finally, the old man finished eating 30 Jin of seafood, and his stomach was very round. He weighed himself, exploded and found himself fat. He couldn't walk, but he still wanted to eat seafood, so he bought 300 kilograms of seafood, roasted it bit by bit, and finally he finished it, but he was surprised when he found that he was fatter than the door of your restaurant. ...