The narrator, "him", is planning to play a prank on his girlfriend, Sophie, by recreating a previous prank where she pushed him into a pool. He convinces Sophie that they are going to a party and she spends hours getting ready. Meanwhile, he sets up the pool to make it look like they are going to the party, but actually, he plans to push her into the pool. He moves inflatable obstacles out of the way and gets into position to push Sophie. When Sophie arrives, he pushes her into the pool, and she gets completely soaked. She initially gets angry but eventually laughs and acknowledges that the prank was well-played.
Here are the key facts extracted from the text:
1. The speaker is planning to play a prank on someone named Sophie.
2. The prank involves recreating a joke that Sophie played on the speaker four years ago.
3. The speaker has told Sophie that they are invited to a super-exclusive party.
4. Sophie has spent several hours getting ready for the party.
5. The speaker has moved two inflatable objects out of the way to set up the prank.
6. The speaker has enlisted the help of a net to move a giant duck out of the way.
7. Sophie falls into the pool and gets completely soaked.
8. The speaker has been getting revenge for the joke Sophie played on them four years ago.
9. The prank was a success, and Sophie found it funny.