Possible Clues:

• Smile — all that could be seen of the vanishing Cheshire Cat
• Emulate the Cheshire Cat
• Look happy when dull work is nearly done
• It may go from ear to ear
• Endless jar producing smile
• Amused reaction or what might partner it around joker's finale
• Make a face, in a way
• Goes w/Shinedown's "Sin"
• Indication of happiness with bother finally swamped by drink
• Sheepish expression