Lefty's self-appointed job is to fish the wire strainer out of the sink. Sometimes he also goes after a toy mouse or a scrap of plastic that I throw in there for him. He gets right at it when he hears that strainer rattling. If cats sweat, surely that's what he's doing. I don't know that he'd be as avid & active if there was a mouse to be caught. Then he hides the strainer, usually under my chair, until I toss it back in the sink.