Burning charcoal gives off a poisonous gas. Even in small amounts, it can cause injury or death. Do stay completely away from a hot grill. Playing near a barbecue grill can cause serious burns if the grill is touched or upset. Don't ever add starter fluid or gasoline to an already lighted grill.
Fire can follow the fluid back to the can and cause it to explode.
To speed a slow fire, carefully tuck dry kindling under the charcoal. Do make sure the barbecue grill is level and steady and keep a container of water nearby. After cooking soak the coals in water. Dispose of the charcoal in a metal container with a tight fitting lid. Many brush fires start because hot coals, thought to be cool were dumped in the leaves.