I was sitting on the couch in our sunny living room eating lunch when Roxy noticed the reflection that my butter knife was making on the ceiling. She immediately spazzed out and went into hunting mode. She showed her teeth and growled. Then she looked at me and gave a pathetic meow, trying to get me to help her get it down, then went back to growling. She paced for a good hour after it was gone.
Here's the proof. Beware, some of these are scary.