In The Godfather, oranges always show up as a motif when someone is about to die.
Vito Corleone (the titular Godfather) gets shot in the streets when buying oranges, kicking off the plot.
Before the severed horse head appears in the movie director's bed, there's an orange on the dinner table that him and Tom Hagen (Robert Duvall's character) are sitting at.
Vito Corleone dies while playing with his grandson in his garden, and he was peeling oranges and put the rind in his mouth.
Oranges show up at the meeting of the Five Families, and then next, we see them all get murdered through strings that Michael Corleone (Al Pacino's character) pulled.