According to director/writer Edgar Wright, it started as a hangover cure that turned into a scheme to get free ice cream — and has nothing to do with the plot.

In an interview with Vanity Fair magazine, Wright said he gave Simon Pegg's ("Star Trek," 2009) character a strawberry Cornetto (an Italian ice cream brand) to eat in 2004's "Shaun of the Dead" as a little nod to his own time in art college, when he used to faithfully eat Cornettos as a way to cure hangovers.

He later tweeted that they gave out free strawberry Cornettos at the film's after party, so he decided to feature Cornettos again in 2007's "Hot Fuzz," the next film he made, starring with Pegg and Nick Frost ("Truth Seekers"), hoping they'd get more free ice cream.

They didn't, but a tradition was established by that point, so Wright included a Cornetto scene again in their third film together, 2013's "The World's End."

Other than the stars and similar comedy style, nothing actually unites the three films besides the ice cream. Thus it became the Cornetto Trilogy.

That all seems pretty haphazard, but Wright is still a very careful filmmaker and he extended that care to these seemingly insignificant details.

SlashFilm.com points out that the flavor of Cornetto used actually corresponds to the films' color schemes: strawberry/red for "Shaun of the Dead," classic/blue in "Hot Fuzz" and mint/green in "The World's End."

That's the kind of detail you get when your director attended art school.

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