These stones usually have three Chinese characters carved on them: shih kan tang. They're all over the place there--on walls, beside doorways, and at crossroads--and they form a kind of supernatural defense system to protect people's homes and property. What they protect against is us.
這種石頭表面通常會刻上「石敢當」三字，它們密密麻麻的分佈在牆上、門邊和交通要衢，將每戶人家都保護的滴水不漏，形成全台灣最堅強的精神防禦系統，而它們所防範的就是吾輩等 ×。