Daniel Radcliffe plays a dead man who Paul Dano uses to ride the waves (via the power of his flatulence. Yep.) on a deserted island in Swiss Army Man.

The film saw half of the audience leave in a rage and the other half enraptured when it debut at Sundance. The basic premise, as you may have guessed, is that Dano's character is trapped on a desert island alone until a corpse (Radcliffe) washes ashore. If this were Castaway, then Radcliffe's body would be one part Wilson and one part -- yep -- swiss army knife.

Dano uses him as a companion, a weapon, and as mentioned, a wave rider. He rides him as the gasses leaving his body propel them forward.

The score from Andy Hull and Robert McDowell of Manchester Orchestra is just as surreal as the film from co-directors Dan Kwan and Daniel Scheinert. In a press release (via IndieWire) Hull says of the film, “[It']s the craziest story I had ever read and I knew that only these two insanely talented individuals could pull off something this ambitious. I immediately wrote and recorded a song with Robert and sent it to them. I guess we did something right because that was when this 13-month process of scoring our first movie began.”

Per the directors' request, no instruments were used for the score. Instead the soundtrack 100% vocals with the idea being that "Paul and Daniel’s character would create their own score in their minds," Hull explains.

Take a look at the first fantastically weird video from the score below.

Montage will be released as a single on June 3 and the Swiss Army Man soundtrack on June 24.

Roth Cornet is a senior editor at Hitfix. She has worked as an interviewer, reviewer, and entertainment pundit for AMC Theatres, NBC Universal, IGN and more. Chat with her on Twitter @RothCornet!