fishmanlee said:cheesy and corny are things like "wow thats a big blue forest!"
To me, it's clichéd lines, like "that's gonna leave a mark" or "he's gonna feel that in the morning." I find that (and Ben Burtt's "warbling"/wah wah obsession) one of the most offensive/annoying things about modern films. I watched a few minutes of Independance Day and heard so much of those forced catchphrase moments that I turned it off. My mother keeps telling me it's a good movie, but I dunno...
Some corn is good, though. A movie like Kung Pow, one of my all-time favorites, is full of it and in that case, I love it.