Chase!

Way back in the day when Isaac was just learning to talk, he loved to have us chase him around the couch.  He loved it so much that he would do negative things to get our attention and then start running to begin a game.  We worked diligently to inform him that we'd much rather play when he's doing good things and he need only ask us to chase him to get the desired result.  "Mommy, chase!" and "Daddy, chase!" became the emphatic call to play for quite some time.

While the frequency of being called to chase has died down, the enjoyment with the activity is undiminished.