Not What You Think
Not every surprise is the good kind and this poor OP found that out the hard way. She was just trying to enjoy some avocado toast when she bit into something hard. Assuming that it was a clove of garlic because it was garlic and rosemary sourdough, she tried to chew it not once but twice.
It was only when she examined it closely that she realized that it wasn’t a clove of garlic but a fingernail that probably belonged to the baker. Now, that’s just horrible! We don’t know about you but we wouldn’t be eating avocado toast or any kind of toast for a while after that.