This was my passenger side taillight.
I noticed some condensation building up a few weeks ago, but it really started getting bad over the past few days with all the rain. I figured this would happen too, because I had the dealer replace my driver's side last year. This time I was, of course, 2 months outside my warranty (thanks, Obama) and I had to replace it myself.
I'm glad I replaced it when I did because, holy shit, look at all that water! If you look close, you can see the water level of the pool inside the housing at the very bottom of the picture. I had no idea it was that bad. My buddy told me to buy a goldfish.
Thankfully, they are ridiculously easy to replace. I know it's a fairly common problem with these cars, so if anyone else is having the same issue, Rock Auto has replacements fairly cheap.