As Billy gets ready to board his spaceship for his long trip to the Mün, he says goodbye to his friends and family, and he is ready to lose it all in the name of science. He steps on the railing, ready for space, thinking of all the memories he had on Kerbin. Time for more memories in space and eventually on the Mün. He opens the hatch to "The LTHV-X", also known as the Long Term Habitation Vehicle. The X was just to make it sound cool.
"Goodbye, friends and family!" Billy would say, and realize that his ship was built by some new person who has no idea what he was doing. Oh well, its in the name of science. "Goodbye!" as he stepped on the ship, he knew he was going to make history for Kerbin.