It could be that the person is too tired to sit up and decided to lie on the floor. Or it might be part of a fantasy or dream sequence in the cartoon where normal rules don't apply.
It could be that he lost his balance and fell. Or there might be some story-related reason, like he's playing a prank or acting in a play and that's part of the scene.
It could be a cozy and relaxing scene, maybe the person is tired and the cat is keeping them company.
Maybe he's too drunk or just being really naughty. Who knows!
It could symbolize her being carefree and having a moment of pure joy. Maybe she's overcome something and is now relaxed and happy.
You might try looking on stock image websites like Shutterstock or Pixabay. They often have a wide variety of clipart options.
It might show a person sitting at a desk, focused on the computer screen, with maybe some papers or tools nearby.
The fun could be that it shows a laid-back situation where someone is in their pajamas at a computer, perhaps suggesting they are too comfortable or not taking the work seriously. It could also be funny if there are funny objects or stickers on the computer or if the pajamas have a comical design.
It might suggest that the person is relaxed and enjoying their time in front of the computer. It could also indicate they are solving a problem successfully or having a pleasant interaction with someone through the computer.
It might be because they are in a peaceful environment and feel safe enough to lay down. Sometimes cats just do it because it feels good!
It depends on your sense of humor. Some people might find it funny because of the contrast between a pig and a hammock. But others might not see the humor in it.