Being honest

Have you ever decided not to tell any lie for a day?
Imagine you have gotten up. You look at the mirrior and say"OK , today I'm the most honest person in the world." and then get ready to go to work.
At first your wife ask you :"Honey , what are you thinking about?" It's hard for you to tell the truth which you have been thinking about her grandma who were nagging all the last night party . So , you answer just "Nothing" and tell yourself I DIDN'T lie ofcourse .
Then you step out and see your neighbor who is washing his car. You look the opposite to pretend that you haven't seen him , because you don't like him and ofcourse you haven't lied again.
you go on and get to work . There is a form on the boared which is about selecting the best employer.You fill it and pass it to your boss and don't tell anything to your collegue because you are afraid of his selection , and still sure you haven't lied up to now.
The day pass very quickly, It's a usual day that was supposed to be one of your best days.
At the end of the day although you are still certain that you have been honest , but you don't feel any self-satisfaction and just wander WHY!!!
What's your idea? ;)