Astronaut

Shelldon is celebrating astronauts by dangling himself from ropes and pretending to be in 0 gravity.

He would have liked to experience real 0 G but he gets motion sickness too easily so decided not to try and become a real astronaut.

Archie is more of a science fiction fan and comes in with a glass of water to throw on the ground and thus pretend like they have a gravity grid, exactly like in a sci-fi movie.

Chip thinks he is being a bit dramatic.