How come????

How come??? is a qeustion that is used every where. I heard it in talking about love,jokes,places and other things. In love i heared thqestion for example " how come people use this word love so easily" How come she got this really funny jokes" How come she knew this place quilkly in just three days. The qeustion how come remind me of cows. I don't know how it is related. I remmber one time i went a film and it was about cows it's name is How come cows are married. From then on i acain't wait to see this fil agaoin