"Yeah, they're loud. I'll show you." He plugs the blender in, then fishes around for some Smoothie Ingredients and eventually settles on some frozen cut up strawberries and bananas from the freezer, milk, and a little bit of ice. He's not going for anything overly fancy, just something so that Grantaire can get the full blender experience. He dumps it all into the blender and warns, "Okay, about to be loud," before turning it on to blend.