Does Watching Violent Movies Make People Think Violent Thoughts?

Does Watching Violent Movies Make People Think Violent Thoughts? was a science project by Rodrick prior to Rodrick Rules.Greg says it was just a exucse letting Rodrick and his friends see horror movies.

Appearances

 * Diary of a Wimpy Kid Online (first appearance)
 * Diary of a Wimpy Kid: Rodrick Rules (first book appearance)

Link

 * http://www.funbrain.com/journal/Journal.html?ThisJournalDay=136&ThisPage=1