Peeping Tom (1960)

  I can't remember where I heard about this movie but it was definitely in the context of it being a banned film.  When this was released in 1960, critics lost their shit and whole countries decried it as indecent, immoral, and not suitable for anyone under 16.  It wrecked the director's whole career.  So obviously I had to see it.

And it's pretty tame by today's standards.  I would definitely say okay for people over 10.  Any younger and you're probably going to have to explain voyeurism, which you may or may not want to do.

Mark Lewis (Carl Boehm) is a shy, retiring photographer and focus puller for TV commercials.  In his spare time, he murders prostitutes and films their faces as they die.  It's important to be well-rounded.  He also rents out the house he grew up in to Helen Stephens (Anna Massey) and her blind mother (Maxine Audley).  Helen takes a shine to Mark and he really wants to stop killing people, or at least not kill Helen, but he also wants to complete his masterwork of documenting his murder process before the cops get him.

If this had been made even five years later, it probably would have been hailed as visionary.  Unfortunately, Michael Powell had to wait over a decade to get vindication.  Since then, Peeping Tom has gone on to be consider a progenitor of slasher films, a meta commentary on film watching, and a masterpiece of horror.  And best of all, it's streaming for free on Tubi.  If you like cult classics, slashers, lurid psychosexual exploits, or stabbing British people, give it a shot.