If you go to the cinema and spend double figures on a seat, your life savings on pick-and-mix, and then don't enjoy the film, I think it's acceptable to complain.
Not complain to your mates though, like many, but to the British Board of Film Classification (BBFC) - the guys who rate your film in advance of release.
I didn't realise people did this, and to be fair, in their annual report, the BBFC admit not many do either.
In their annual report, they said: 'The BBFC generally receives a relatively small number of complaints about its classification decisions' - but that still didn't stop people.
Top of the list was Deadpool. It was given a 15 rating, which to the BBFC means: 'adult themes, hard drugs, (frequent) strong language, strong violence, strong sexual references, and nudity without graphic detail'.
Credit: 20th Century Fox
Yet still, complaints occurred. The BBFC commented: "The film Deadpool generated the largest amount of public feedback in 2016, with 51 complaints.
"... Some viewers were concerned about the level of violence in the film."
Yet, they defended their categorisation, adding: "Though the violence is strong and frequently bloody, this often occurs during fast-paced action sequences with little focus on detail.
"There is also a comic tone to the violence, and the film's fantastical setting further distances it from reality."
They also adding that some viewers were offended by the number of sexual references in the film. However, the BBFC confirmed their decision to rate it at 15, saying that these references were often in a comical setting.
It didn't stop Deadpool grossing $783.7m (£596.4m) at the box office, Marvel Comics ninth best performing film.
Second in their list was Suicide Squad which received 30 complaints - again rated 15.
Credit: Warner Bros
"Most of the feedback was from children under the age of 15," added the BBFC - well, it's their own fault then.
"The sustained threat and moderate violence in Suicide Squad were too strong to warrant a 12A."
A 'too scary' Miss Peregrine's Home for Peculiar Children was complained about 20 times for its 12A rating.
Credit: 20th Century Fox
Jason Bourne, also a 12A, saw 19 letters of complaint sent to the BBFC, as did Sausage Party. The first was based around the violence levels, while for the latter it was all about the sexual references.
Eighteen people complained about 10 Cloverfield Lane, and 10 letters of disbelief were written about Batman v Superman: Dawn of Justice (12A); both having their violence questioned.
A 12A is rated around it's 'mature themes, discrimination, soft drugs, moderate language, moderate violence, sex references and nudity'.
Featured Image Credit: PATopics: Movies, Deadpool, Suicide Squad