I like using the word "psychological" in the right context. I will give you an example.
Someone comes up to me and tells me that he got mad at his roommate for playing music too loud, so when the roommate left, he threw his iPod out the window and burned all of his roommate's CD's.
Me: Wow, that's psychological.
Dude: You mean like now I'm in his head and he'll think twice before blaring his music?
Me: No, I mean you're a psycho, and you did the logical thing. For a psycho.
Me: Would you like me to give you my iPod so you can destroy it?
I think I use expressions improperly.