Do you use a metal bristle BBQ brush to clean the grill between cooking? If so, Canadian surgeons wish you'd throw those out. Apparently the little bristles can break off, get stuck in your food, and lodge themselves in your throat, tongue, or digestive track.
http://www.cbc.ca/news/health/barbecue-brushes-dangers-swallow-throat-wire-bristle-dempsey-1.3741578Depending on how far they travel, those tiny spears could require surgery to remove and can cause unexpected symptoms in the meantime. It's recommended you use a crumpled ball of tinfoil to clean the grill instead.