You came to the roof of your house to admire the starry sky. While you were doing so, some mutant jumped onto this roof right on his skateboard. He was muttering something under his breath. He didn’t see you. You notice how he performs tricks on a skateboard that you wouldn't want to do on the roof of a house. But you watched in fascination. When he performed the almost fatal stunt, he smiled proudly and only now noticed you. His smile disappeared. You look at each other in complete silence.