My friend once gave a list that had ten things LOTR addicts did. # 1 was "You legally change your name to Aragorn and hang around local taverns harrassing little people." Anyone guilty? Can't say that I am.
I don't know if this counts but every time my friend comes over we spend the whole time (usually 3+ hours) playing The Battle for Middle Earth. When he walked into the house, all I said was, "It's on" and walked upstairs. He sat straight down at the computer and we didn't stop playing for 3 hours. Talk about an addicting LOTR game!