The molting is a cool phase. You'll wake up one morning and it'll look like there are two tarantulas in his cage.
Update: Okay so we figured out why baby Oliver (my pet tarantula) is running away from his food. He is apparently getting ready to molt! I am very happy because that means he's growing up! Just thought I'd give you an update! Thanks!~ Alice X.R?
We used to have a pet spider. His name was Fred. (I dunno how we knew that, I think he just told us.) He'd disappear for a year or two every now and again but always came back. Made us believe in reincarnation because his name was always Fred.