When I first got my 2 balls I was cleaning the tanks and somehow forgot to put the top on one of the tanks, came into my room sometime later and about had a heart attack when I saw the screen top off. It took only seconds to find my little normal girl crawling around a shelf behind her tank. I was lucky.
The second and last escape was my 1800 gram male. This was when I was living with a friend but my snakes were still home, my younger sister would water them and watch the temps for me and I would come home once a week to feed/clean.
I guess my youngest sister forgot to put his screen top back on and he got out. My other sister called me FLIPPING out "One of your snakes is out!" after her trying to talk me into driving the 30 minutes home, I finally talked her into picking him up and putting him back. That's a day she will never forget xD Gave me and my friend a good laugh too (she heard the entire phone convo)