
In the BBC article of a novelist Clare Allan I read this quote, ‘I've always been fascinated by lying. I think it's the fact that when people lie they are free in a way that they're not when they tell "the truth" - whatever that means.’ We had pretty intense discussion whether it is freedom where one can do or tell whatever he wants or prison, full of stress, anxiety and cognitive dissonance.

I remember my grandpa. He was a great storyteller! Most of his stories were based on real episodes, anecdotes from his life. But every time he told them, they slightly differed. When somebody tried to find him out in a lie, he replied ‘I never lie. I just decorate a story’, and he did, and it was such a pleasure to listen! After that I realised that lying could be fun, lying could be creativity, lying could be freedom of thinking.

Here are some common patterns to add: a person who shades the truth tends to look on the left (*appropriate only for right-handed); there are some difference in the voice, its pace and pitch; look in the eyes to check your reaction; add many details to convince you.
I hope these tips will help you. Of course it does not mean that you should tell at once ‘aha, I know that you’re lying!’ because if someone does it, he usually has reasons for that, if this is not a pathological liar.
If you are not going to stop lying but want to improve your ‘lying skills’, check the article ‘How to be an effective liar’.
Here are more resources:
1. TED-talks http://www.ted.com/talks/pamela_meyer_how_to_spot_a_liar
2. BBC article ‘The good side of lying’ http://www.bbc.co.uk/news/magazine-16612884
3. Video of an expert Vanessa Van Edwards http://www.scienceofpeople.com/2012/04/how-to-tell-when-people-are-lying-to-you-video/
4. How to be an effective liar lifehacker.com/5674334/how-to-be-an-effective-liar
4. Interesting facts about a lie http://mashable.com/2013/12/20/psychology-of-lying/
5. More facts http://io9.com/10-things-you-didnt-know-about-lying-1175676651
6. Movie ‘Liar Liar’ with Jim Carrey