Gay-themed "straight" movies?

In one of the few instances I can remember, I agree with Focus on the Family that "Happy Feet" is a very gay movie, even without any gay characters. (Only I applaud the fact, not denounce it like FOTF)

Another example that immediately comes to mind is "Thumbsucker," a movie I think every high school student should see, just in case.

I'm sure there's tons more. What's on your list?