Lying - some people are great at it (Lance Armstrong practically made an Olympic sport of it) while others are miserably bad.
Most people can understand little white lies, but you'd be hard pushed to find anyone who likes being lied to. Writing on Today.com, Dr Gail Seltz asks why we dislike liars so much.
She says: "It’s a matter of trust. When a person lies, they have broken a bond – an unspoken agreement to treat others as we would like to be treated. Serious deception often makes it impossible for us to trust another person again. Because the issue of trust is on the line, coming clean about the lie as soon as possible is the best way to mend fences. If the truth only comes out once it is forced, repair of trust is far less likely."