First hand sign I know was clapping hand. When birthday song started, I know when to start the clapping hand. Birthday cake and party is not the birthday boy, is for me and all the kids.

We like birthday party is because all of us have the chance to blow the candle and cut the cake.

Please give everyone of us a knife, the cake is for every one, not the birthday boy. ( April 2015, Birthday celebration for Chen Bin)