So here is one. While I was working in a pet shop we got in a 4 foot Boa. Without thinking about it. I just reached in the bag and pulled her out. Needless to say she was a bit annoyed and decided to latch down on my hand.
I was not aware of the issue with Calci Sand at the time, but I had a KSB about 25 years ago, and I kept him on Calci-Sand.
We had a 16 Foot Retic at my old school. We tried making a small pool for the snake to soak. When we put it in her cage we were not thinking all that well. So we put it in her cage, and right away she spilled it. Little did I know that the corners of the enclosure were not sealed properly. After about 24 hours sitting in water everything swelled. We had to build a completely new enclosure.
This isnt about snakes, but its still husbandry.
So I bought a scorpion. They put it in a box with Air holes. On the way home my girlfriend was holding the box. I don't know how, but the scorpion managed to sting my GF through an air hole. Well come to find out she was allergic to the venom, and I had to go to the hospital ASAP.
I will see what else I can remember, but this is it for now.