On advice of this thread, I just gave Spock a carrot. He acted like he'd just fished something out of the garbage and wanted to keep it away from me before I took it away from him, and then settled in on the couch to chew on it for a while. It's something to keep him busy and happy while I'm getting ready for work (um... checking email and posting on forums is part of that process, I swear!). Good times!