Lightning can strike items and people through windows. As a result, the National Weather Service advises people to stay away from windows during lightning storms.
While being inside during a storm is significantly safer than being outdoors, lightning can still strike. Lightning that strikes near electrical components can injure people holding phones or electronic devices, so experts recommend avoiding wired phones during storms; cell phones are not at risk as long as they are unplugged. Lightning can also strike pipes, allowing the lighting to propagate into bathtubs, showers and sinks. Concrete sometimes contains metal bars, so experts advise people to avoid leaning on concrete walls or laying on bare concrete floors during storms.