THE BIG CHILL (1983) Lawrence Kasdam

Highschool friends reunite (without the advantage of Facebook) to attend the death of one of their pals. After the first night, they wake up to make breakfast and without even helping it, they start dancing to the old songs. The scene is iconic of how we still keep the flame of our youth hidden somewhere, before our consciousness takes over and reminds us we're other people and we've changed to adjust to the big chill