a. Ignore him
b. Keep on talking on topic that his best interest until he open his mouth and talk to you back
c.Buy him beers
d.kiss him and look at his eyes then tell him with big eyes blinking "my baby...."
(note to myself : if small children then maybe look cute sulking, but adult? maybe next time should buy rubber band and tie around that mouth)
p/s : you know i love you.