The Cornetto Trilogy

Slightly weird one, but Cornetto have had success in product placement within films: Shaun of the Dead, Hot Fuzz and the World's End which is to be released this year! The three original flavours have been used, and symbolise an element of the film. Clever as it is subtle, although it seems quite random. But supports British enterprise and shows that it is a comical, light-hearted brand.

Excuse that this is from Wikipedia, but I think this sums up the Trilogy best:

The Three Flavours Cornetto trilogy (also known as the Blood and Ice Cream trilogy)^[1][2] is a series of films directed by Edgar Wright, written by Simon Pegg and Wright, produced by Nira Park, and starring Pegg and Nick Frost.

The first two films in the series are Shaun of the Dead (2004), "a romantic comedy with zombies", and Hot Fuzz (2007), a buddy cop action/comedy film. A third film, The World's End,^[2][3][4]began shooting in September 2012 for a 2013 release.

Each film in the trilogy is connected to a Cornetto ice cream flavour – both of the films released to date feature scenes in which one of the main characters purchases a Cornetto of the appropriate flavour. Shaun of the Dead features a red strawberry flavoured Cornetto, which signifies the film's bloody and gory elements,^[5] Hot Fuzz includes the blue original Cornetto, to signify the police element to the film,^[6] and The World's End will feature the green mint choc-chip flavour.^[2][7] The use of the three flavours/colours of Cornetto is a reference to Krzysztof Kieślowski's Three Coloursfilm trilogy.^[8]