I second (or third or fourth) the food idea.
I had a free range Jackson when I was living in Hawaii...found him on my shower curtain one day, hiding in the folds between the liner and the curtain. Still dunno how he got there, unless he squeezed under the door...either way, I felt slightly dirty for taking a shower and having my chameleon eye me with those googly eyes. it was very psycho-esque. lol.