Examples of movies w/ leading actors supposedly romantically linked but showing no chemistry.

This started out as a Matthew McConaughey-with-anyone post, or maybe it was a Nicolas Cage post, or maybe Julia Roberts. Anyway, can you think of more examples (films / actors)?

Jada Pinkett w/ Cheadle in Reign Over Me was a little questionable, even given where their characters are supposed to be for most of the movie.

I also think this is one of Christian Bale's weaknesses as an actor.