Cats definately love "investigating" anything open! Years ago, my ex-wife had a cat that decided to come in the room where i was working on the Curtis Mathes. I didn't see her, and left for a moment to find a tool. The set was on with the back off and the high voltage cage open. When I returned a few minutes later, guess where I caught her about to put her nose! Well, I shouted at her and she took off like a rocket. I suppose it was better than she "going up" like a rocket!
After that experience, I would leave the cabinet door under the kitchen sink open while working on a set. That empty cabinet would keep her entertained for hours!
Kinda reminds me of the movie
Christmas Vacation where Randy Quaid says, "If that cat had nine lives, it just spent them all!"