I’m in trouble (again) because someone read my recent Cactuseaters post and was scared to let her mom see “Avatar” because she thinks the 3D sensation will make her mom seasick and nauseous. For the record, I did not feel dizzy or vomitous during the movie. It’s worth mentioning, because I once saw a movie, “The Blair Witch Project,” during which five people in the audience fled the theater to throw up. Seriously. I think it was the herky-jerky hand-held camera style that did it.