The song "Last Friday Night" by Katy Perry describes a wild party she had with friends where they got drunk and went streaking in a park. The music video depicts Katy as a stereotypical geek who is transformed after attending a high school party. It uses 1980s aesthetics and costumes to represent different cliques like jocks, geeks, and cheerleaders. The purpose was to show that anyone can have fun, regardless of their differences. Katy revealed the song was inspired by her real experiences partying with friends in Santa Barbara one night.