A while ago, I saw a black blur moving in the kitchen. It moved so fast that I had no clue what it was. It was definitely too big to be a bug. I saw it twice and my husband had trouble believing that I wasn't just seeing things.
Then we noticed the nibbles, and realized we had a mouse to catch. Turned out to be a few mice, actually. I wasn't crazy.
The cat probably has a secret path that you don't know about. Is there an odd window or vent that you may not have checked?
I'd say, if you saw the colors of it, it exists, and you're not nuts.
