Where is the punch line of Wang Yuanshi's joke?

1. A group of students went to their suburban home to play. We bought some watermelons to put in the kitchen. I asked a classmate to take a knife to cut it. I haven't been back for a long time. While wondering, he came with a cut melon in his hand and said in a panic, "I cut the pumpkin." Everyone laughed wildly, but two seconds later, everyone laughed even harder. It turned out that he had a melon in his hand!

2. Once upon a time, there was a lamb. One day, he went out to play and met a wolf. The wolf said, "I will eat you!" " "As a result, the wolf ate the lamb.

Go to McDonald's to buy a cone, and it's finally my turn. I can't wait to say, "Give me two rollers!" " I didn't expect the waiter to say loudly to me; "Two rollers, four dollars!"

Once upon a time, there was a polar bear. A bear was bored and decided to go to the South Pole to play with penguins. So he set off, walking and walking. After walking for three years, he suddenly remembered that the gas at home was irrelevant, so he turned and turned off the gas. Turning off the gas, he set off again, walking. After walking for three years, he arrived at the home of the Antarctic penguin and knocked at the door: Penguin, Penguin come out, let's play together. Penguin said: No more playing.

5. A frog came to the town and said, "Whoever kisses me will be the queen!" All the girls in the town came to see it, and the last girl stood up and kissed the frog. Bang! She suddenly turned into a female frog. The male frog said happily, let's go to the pond to get married!