Actually, I had that happen the first day I bought my GT. It's an adult male, and I picked him up from the Phila show. When I got home, I decided not to handle him and just put him in his new enclosure. Well, I picked him up and right then he grabbed a hold of me. Not even a struggle, just a bite and let go, but man did that hurt. It felt like putting your hand in a vise with needles attached. And you can bet that thing bled. Oh well, atleast he hasn't bitten me since then.