This is slightly disturbing if you use CFLs

Because they contain mercury, if a Compact Fluorescent Light bulb breaks, you need to open a window and evacuate the room for 15 minutes, turn off the A/C, and (the following is for hard flooring, quoted from the EPA website, there are different instructions for carpet):

• Carefully scoop up glass pieces and powder using stiff paper or cardboard and place them in a glass jar with metal lid (such as a canning jar) or in a sealed plastic bag.
• Use sticky tape, such as duct tape, to pick up any remaining small glass fragments and powder.
• Wipe the area clean with damp paper towels or disposable wet wipes. Place towels in the glass jar or plastic bag.
• Do not use a vacuum or broom to clean up the broken bulb on hard surfaces.