are u a good liar?

I don't wanna lie to anyone. I hate lies and the feeling of being cheated. Well, I still can be a good "Liar". One day my friend forced me to play a joke on her classmate. It's just a prank. I called him and told him that I had a secret crush on him. He believed and felt very proud of himself. LOL~~ I asked me friend why chose me to be the liar. Her answer shocks me: Anyone who is upright everyday is a promising liar.

Unfortunately, I'm not. My friends say that they could always tell if I'm lying because my facial expression gives me out all the time. I tried to have a blank face but still, they could tell. Most probably because my parents told me not to tell a lie ever. Although, I assure you that I have told lies several times. Either my parents and friends just let it pass or I was able to pull it off. I don't really want to know. :)