If you have a wobbly sconce on your wall fix it ASAP! The tug on its own wiring can cause loose connections thus a fire potential! Electricity will jump any gaps between wires generating a flash of heat. Always check your fixtures after changing bulbs or dusting and tighten as needed. If it still wobbles call an electrician. Don’t forget to check garage lights as they notoriously loosen due the the heavy vibration of the doors.