Over the last few months, I've started catching up on all the movies I've missed since my boys were born. After a slow first 15 minutes, The Descent is far and away the best of the horror movies I've watched. Kind of like a female version of Predator, but played for relentless tension instead of laughs. Or like Pitch Black, trading less charismatic leads for far better designed monsters. It's a $2 rental at Amazon. (Director Neil Marshall also directed the Blackwater episode of Game of Thrones.) The posters for the film are very weak though, aside from this Japanese mini-poster:
Available at eBay.