Bruce Willis wasn't credited for part in Quentin Tarantino movie due to bizarre rule breach

Bruce Willis was not credited for his appearance in one of Quentin Tarantino's lesser-known movies due to a bizarre rule breach.

Willis appeared in Four Rooms in 1995 for free as a favour to the director, and simply to enjoy himself, which meant the megastar could not be given a screen credit.

This came just a year after the pair had collaborated on the huge hit Pulp Fiction.

Four Rooms is an anthology of four stories with each directed by someone different - and in a different hotel room.

It follows a porter on their first day at the fictional Hotel Mon Signor as he encounters very different guests and experiences in each segment.

Bizarre: Bruce Willis was uncredited in Four Rooms in 1995, as Screen Actors Guild rules prevented it on the grounds that he was unpaid

Bizarre: Bruce Willis was uncredited in Four Rooms in 1995, as Screen Actors Guild rules prevented it on the grounds that he was unpaid

Team player: Quentin Tarantino was one of four directors for the movie, each responsible for one of the titular rooms

Team player: Quentin Tarantino was one of four directors for the movie, each responsible for one of the titular rooms

You're welcome: Willis appeared in the movie for free after working with Tarantino on Pulp Fiction as Butch Coolidge

You're welcome: Willis appeared in the movie for free after working with Tarantino on Pulp Fiction as Butch Coolidge 

Tarantino directed the final part, Penthouse - The Man From Hollywood, where he also stars as a fictional movie maker named Chester Rush, alongside Willis as one of his friends - Leo.

When the protagonist, Ted (Tim Roth), enters the penthouse he is met by Leo arguing with his wife over the phone, while he and Chester celebrate the success of a recent film.

The movie flopped, but did not break Tarantino's stride off the back of his breakout work Pulp Fiction, which was also significant for Willis.

The Die Hard actor was on the back of a string of underwhelming appearances at the time, hence why he perhaps felt like he owed Tarantino - so much so that he took no payment for his appearance in Four Rooms.

Multi-talented: As well as directing Penthouse - The Man From Hollywood, Tarantino appears as the successful director, with Willis playing his friend

Multi-talented: As well as directing Penthouse - The Man From Hollywood, Tarantino appears as the successful director, with Willis playing his friend

However, according to the Screen Actors Guild (SAG) rules, that prohibited him from getting a nod in the credits.

Those who were formally acknowledged for appearing elsewhere in the film included Madonna and Antonio Banderas. 

Perhaps, given the film's mixed reception, being left off the credits was a blessing in disguise.

He went on to maintain his reputation on the back of playing Butch Coolidge in Pulp Fiction, with acclaimed performances such as that in The Sixth Sense and appearances in less well-received blockbusters such as The Jackal and Mercury Rising.

Bruce was diagnosed with frontotemporal dementia last March.