lightbulb breaks by itself
1. That bulb was bad. (OT) Once in a blue moon compact fluorescents break when you screw them in because the glass had a thin spot. (OT) Not too many years ago in China, TV picture tubes once in a blue moon broke for no good reason even when the TV was off.
2. After the fixture was installed, strain was put on the bulb because the fixture was warped or crooked or too small and some part pressed on the bulb.
3. (Outdoors) Vandalism.
The disadvantages of crab apple trees. In summer, the apples are too sour to pick and eat. In winter the birds come and leave dropping all over the place.