Just awful. Who thinks up a story like this?

Rating: 3/10 (5 November 2015)

Tonight I worked out while in front of the TV watching Oldboy. If you've thought of watching it, DON'T - be warned. It was recommended to me by a friend and was ranked in the top 250 movies of all time on IMDb, so I decided it was time to watch it.
HOLY CRAP did it leave a bad taste in my mouth. It started amazing, the cinematography and music were incredible, I couldn't turn away (which is why I gave it 3 stars instead of 1)... but it took a VERY DARK and disturbing descent at the end, (mind you, it was pretty dark throughout) and I truly regret having seen it.
I wish I'd have read this review first from another IMDb user, it sums it up pretty well: "A good plot twist should leave the viewer going "wow, why didn't I think of that?" not "OMG what kind of sick %#@$% would even begin to think that?"
It's a really F#$%ed up story, I didn't see it coming, I wish I hadn't seen it at all.