Closing scene of "Black Letter Day". Both Janet and Chrissy agree that Jack sucks his thumb in his sleep.

What do you think? Were they pulling his leg, or did they really sneak into his bedroom?

It's possible, but I think they probably saw him sucking his thumb on the couch. Jack seemed to spend a lot of time sleeping on that couch during the first couple of seasons whenever they had a houseguest. :lol: