Over and over, MTV’s Josh Horowitz mock-pleads with Jennifer’s Body star Megan Fox to sing “Over The Rainbow.” And all she does is refuse with that reedy little voice and a testy look on her face. “What is this about?…I’m not gonna sing it.” In short, Fox hasn’t much confidence, isn’t into relaxation or chuckling at herself, clearly knows she’s limited and that it’s safer to stick to reading lines in movies, and hasn’t much gumption. I mean, I could do “Over The Rainbow” on MTV.com. I could hit the notes, I mean.