It's a bad idea to crack eggs directly into the batter bowl, because there's a greater risk of tainting it with eggshell shards or a rotten egg. Instead, crack each egg individually into a separate bowl, check for any shell, and make sure the yolk isn't broken before pouring the raw egg into the batter bowl. Remove shards by taking the empty eggshell half and using it to scoop the shell bits out of the gelatinous egg.