Otto tipped over his water dish so I was taking it out so I could fill it back up again, and he started striking at the container. I guess he was freaked out that his dish suddenly was out to get him.
I also had planned on handling him today (I made a thread about him being agressive, for those who haven't seen it), but I don't think that's going to be happening today
Video..
Edit: Just tempted my luck and got him out, he struck at me and bit himself. :/