Pitter-Patter Christmas Eve (ときめきの聖夜, Tokimeki no seiya?) is the tenth episode of Urusei Yatsura. It originally aired on 23 December 1981. Its opening theme is Lum no Love Song and its ending theme is Ucchu wa Taihen ja!. This episode also the first long term released animation and the story is divided into 2 parts, Part 1 and Part 2.