I can tell you're lying to me...

I can tell you're lying to me. There are a few tale-tell signs.

• You look away as you're answering- down to the right to be exact.
  
• You answer way to fast- clearly you thought over your answer before I asked the question. You knew it was coming.
• Yet as quickly as you answered you sounded a little uncertain.
  

I know you lied- it was the stupid thing too. Why do it then?