The art of convincing yourself that what you're saying is true in order to justify lies to cover lies to cover lies to cover lies, etc. If you believe it to be true in your mind, you've already won half the battle.
When I didn't show up or call I knew that had to come up with a pretty good Ralphalization in order to avoid catching shit from everyone. I said that my dog ate my homework, an old friend came in from out of town, my clothes were in the washing machine, I was shaving, my cellphone isn't working...and all of those things really are possible. Therefore, I really didn't lie!