3. Blue Valentine (2010)

Blue Valentine is more than a title—it's exactly what you'll experience if you opt for a private screening with your woman friend this evening. Choose not to heed our words of warning and chances are you won't have one by morning.

In this bleak tale of bad romance, Ryan Gosling (who we already warned you about) and Michelle Williams star as a once-madly in love couple whose evolution viewers witness into a duo that can barely stand to be in the same room with one another. (And no, not in a quirky Katherine Heigl way.) If you happened to catch this in theaters, there was no missing that first nonverbal exchange between couples that said it all: "So...should we just throw in the towel?"