It’s spring, PopWatchers! The sun is shining, the birds are chirping, those dreary winter days are far behind! But despite all those wondrous things, I still have every intention of picking up a copy of Blue Valentine, drawing the shades (blasted sun causes a glare!) and crying my eyes out as I watch one of the most heart-wrenching movies of 2010. Scratch that: Ever.

For me, Blue Valentine ranked right behind The Social Network as the best film of 2010, thanks to the staggeringly great performances from Ryan Gosling (his Oscar nom snub? Unforgivable!) and Michelle Williams, who play a couple who fall apart as the years go by. Still, the movie completely deflated me. As Oprah would say, it gave me the ugly cry.

But I’m more than willing to go back to the well (that well, of course, is filled with tears) for Blue Valentine. Yes, it’s going to bum me out again, but it will be worth it to watch Gosling and Williams create one of the most authentic, albeit doomed, couples to hit the silver screen in a really long time.

My colleague Mandi Bierly wrote a great post last week about movies she can’t bear to watch again because a certain scene is too hard to sit through (I, like so many of you, haven’t dared to sit through Million Dollar Baby more than once because of that freakin’ ending), so I’m curious to know the opposite: Which movies you sit through in spite of the fact that they are powerfully depressing?

In addition to Blue Valentine, I watch In America and Eternal Sunshine of the Spotless Mind even though both turn me into a blithering mess. I just love them too much to not watch them again.

So tell us PopWatchers, which movies will you watch again despite the fact that they really bum you out?