“What have you done for fun lately?”
For years I have asked this when greeting folks in person or on the phone. The results are along the following lines.
*glazed over as they are only waiting for their turn to talk
*no real answer
*”hmm” whispers over their lips as they grasp the question
*fire-hose response of their fun adventures
Fun needs to be a requirement. Talk about it everywhere or better yet do fun stuff.

