Whether or not this is a postive reaction, I cannot say.
Joseph Gordon-Levitt, star of things such as Third Rock from the Sun and the great action thriller Premium Rush, went on Jeopardy sixteen years ago. Knowing what the dude is all about now (semi-mysterious hand-on-chin poses and constant disapproval grimacing), it seems pretty out of character. What a hyper kid.
In other news "Catcher in the Rye" is (or at least was) JGL's favorite book. Probably more importantly, this is information that totally has an affect on your life.