To get the theme song stuck in your head, the key is to combine repetition with a catchy melody. Repetition ensures that the song is constantly played in your mind, while a catchy melody makes it more memorable. According to a study by the University of California, Los Angeles (UCLA), repeated listening to a song increases its memorability by 50%. Additionally, a study by the University of Sheffield found that songs with a simple, repetitive melody are more likely to become stuck in your head. This is because the brain is wired to remember patterns, and a catchy melody provides a strong pattern for the brain to latch onto.