It's hard to believe that the trippy Richard Kelly movie is already 20 years old.

Sharing a 'Donnie Darko' tribute with his 6.3 million followers on Instagram, actor Jake Gyllenhaal spoke of how much this movie means to him. The mind and time-bending sci-fi starred the actor in what was his first major break-out role.

Just like the movie premise centred around 28 days, filming of 'Donnie Darko' was also wrapped after less than a month. The inclusion of a killer soundtrack, as well as a homicidal bunny named Frank, ensured that the movie would do down as a cult classic.

20 years on from its release, Gyllenhaal, who was 19 at the time of filming, has taken to his social media in order to share how he feels about its anniversary.

Sharing his original script and artefacts that he's kept from the movie, Gyllenhaal wrote: "Pulled out my script and some artefacts from Donnie Darko... It was released 20 years ago today.

"It’s a film that changed my life and my career and it’s been unreal to watch this story find afterlives with new audiences and new generations, and yet, what Donnie said to Roberta Sparrow is still true: 'there is so much to look forward to.'

"Thank you to all the fans who’ve come up to me over the years with that confused look on their faces and asked me: 'what the f**k is Donnie Darko about??'

"Happy 20th Donnie! Let’s keep confusing people. Here’s to 20 more."


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A post shared by Jake Gyllenhaal (@jakegyllenhaal)