Boneheaded me left one end of the siphon in Tommy's fish tank and tied the other end of the tube to the fish tank. I casually went to look for a book I could read while draining the rest of the tank. The siphon tube having an intelligence far greater than my own untied itself and proceeded with the work of draining the tank all over Tommy's floor. I don't think anything took any irrepairable damange.
The first weakness: Having intelligence and not using it.
The second weakness: I lost my temper but should not have. As hard as I tried, yelling did not make the water jump back into the tank. Apparently water doesn't scare easily.