A smoldering cigarette butt could set the trash on fire. You can't see wires hidden inside walls and ceilings, but there are some warning signs of electrical problems. If lights dim or flicker, fuses blow frequently or sparks shoot from receptacles when items are plugged in or unplugged, consult an electrician. Faulty electrical cords can also spark a fire or cause an electrical shock. Never run cords under rugs or heavy furniture.
Pressure can crack insulation and break the wires.
Don't overload outlets. Children with matches. Children playing with matches or lighters are the leading cause of fire deaths for children 5 and under. Keep these items up high, preferably in a locked cabinet, out of the sight and reach of small children. Teach older ones how to handle matches responsibly.