I worked on a show that used The Police's "Every Little Thing She Does Is Magic." When the song gets to the "Eee-Oh-Oh" refrains towards the end, an actress was staged to enter screaming and crying, cutting the song out on a 0-count. Three and a half years later, when I hear the song get to that refrain and then continue, I get extremely nervous because the actress must have missed her entrance.
In a less intense Pavlovian response, the theatre I currently work at did Xanadu this past winter. There was a specific mystical chime that played immediately before each of Kira's entrance, which was usually followed by a "Sonny Maloooonnnnne" in an Australian accent. This fall we did Cabaret, and what did the musical director choose to use as the mystical chimes that play when Fraulein Schneider opens the bag and sees the pineapple? At every Cabaret performance at least one crew or cast member showed off their best Australian accent when the pineapple was revealed.