20 Recent Movies With INSANE Twists
5. Will & Cin Are Siblings - Bone Lake
Last year's erotic horror-thriller Bone Lake follows a couple, Sage (Maddie Hasson) and Diego (Marco Pigossi), whose remote lakehouse getaway is interrupted by another couple, Will (Alex Roe) and Cin (Andra Nechita), who claim to have booked the very same house.
It's ultimately little surprise that Will and Cin are actually a pair of psychopaths who relish playing mind games with other couples before killing them.
But what audiences probably didn't expect is the third act reveal that Will and Cin are actually siblings, siblings who killed their parents when they found out about their incestuous relationship.
Since then, the duo have been terrorising and murdering couples at their family's estate for kicks.
Much as "incest outta nowhere" can't help but feel like a shock value plot twist most of the time, in this case it at least helps make an already unsettling story that much more disturbing, especially as it's so genuinely unexpected.