Matthew McConaughey — ‘Titanic’

Leonardo DiCaprio went from child star to mega A-lister in 1997 with 'Titanic,' but did you know that the role once went out to Matthew McConaughey? Yeah, McConaughey's had a great comeback in the last year or so with parts in films like 'Magic Mike' and 'Killer Joe,' but 1997 McConaughey in 'Titanic' would have been bad news for everyone involved.

In an interview with MTV regarding the 3D re-release of the film, James Cameron said he would neither confirm nor deny early casting rumors: "I just don't think that's cool to talk about actors that either chose not to do it, or were unavailable, or stupidly decided that there wasn't enough meat on the bone of the character, or whatever it was." When asked about whether those actors should have come back begging for a second chance, Cameron said, "They should've come whimpering back afterwards and said, 'I will never second guess you again as long as I live.' But it's too late. You got one chance, that's it. And you might want to think about this next time when you get called."

Stay classy, James Cameron.