short circuit

I've spent half a day looking for a short circuit in my father's house. As the wiring is 45 years old  I feared for some burned wires. Nothing could be found until I took a look at the charming little lantern outside that nobody uses.

As soon as I noticed the water inside the lightbulb I knew what happened. The bulb broke ages ago and  the circuit was powered all the time.

There is water in the bulb.