First off, the classic: PSYCHO. When you're dealing with a psychopathic caretaker and his penchant for assuming the role of his deceased mommy, ya know it's gonna be a rotten vacation.
Or, if you're in the mood for more of an 80's Slasher film, why not turn to the never disappointing FRIDAY THE 13TH! That's right, good old Jason Voorhees' mother plays the revenge game. A great Mother's Day treat!
Why not watch a great movie from the director of THE LORD OF THE RINGS! What? He did a Mother's Day horror movie? Yep. Check out DEAD/ALIVE where Lionel's mom get's bitten by a Sumatran Rat Monkey spreading the zombie virus all over the house!
As it turns out, there's even a flick with the title MOTHER'S DAY that more or less focuses on two boys and the lengths to which they'll go to... um... impress their mother.
And yes, *sigh*, there is a remake happening.
Of course you could turn to the absolute viciousness of Faye Dunaway and watch as she slowly drops away into utter madness.... without wire hangers.
And finally, there is the trilogy of terror directed by Dario Argento starring his amazing daughter, Asia called 'The Three Mothers', including: Susperia, Inferno, and The Mother of Tears. It's all very artsy... oh, and gory. Really gory. With witches.
So there ya go! Gather up your moms and get some FOUND HORROR in your Mothers Day! Have a happy one, everyone!