The other day we could hear the handymen replacing the fence in our backyard -- they were laughing about the "water bulbs." They were actually talking about the Smith & Hawken Cafe Light Strings hanging over our patio. They were there when we moved in, and we've always found it fascinating that although most of the clear glass bulbs are full of rainwater, the light strings still work.
Obviously the handymen also found it entertaining.
We assume that eventually they'll stop working. But since we really love the festive look and are impressed with their sturdiness, we'll undoubtedly end up buying more.