I've been watching Sweetie carefully this week. He not only replaced the battery in his car (finally), he single-handedly repacked the garage the following day, he washed the dishes in the sink, he vacuumed the living room, and he drove to the hardware store 3 towns over to get something we needed. And I've received 3, count 'em 3, backrubs this week.
He did all of this with my asking. He did all of this without pointing out that he did it without my asking.
I don't know what's going on--but I like it! I have my suspicions and I haven't ruled out alien abduction, but until he sprouts tentacles or an extra head, I'll be keeping him.