Smile

You can fake smile in front of people or you can have a real smile or you can have a shocked smile like when you see a calf being born
my favorite is a shocked smile they are happy but surprised that some one did that for you
what is your favorite
but the one i use the most is fake i am good at it too use it around my parents i think of some thing i think is funny and they go along with it
what one do use the most