It Movie Easter Eggs
10 Things You'll Only Notice in the It Remake If You Read the Book
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"Beep Beep, Richie"
While Richie is trapped in that awful clown room upstairs, he comes face to face with Pennywise. Just before It jumps off the casket and lunges, It says, "Beep beep, Richie." In the novel, the other Losers say this to Richie quite a bit. Since he's so obviously the loudmouth of the group, "beep beep" is a way of telling him he's crossing a line. It basically means, "Joke's over, Richie." The fact that Pennywise says it is a fun call-out.
