Any tool dropped while repairing a car will roll underneath to the exact center. I believe I'll have another drink. You will always remember that you forgot to take out the trash when the garbage truck is two doors away. It doesn't matter what you do, it only matters what you say you've done and what you say you're going to do. Eat one live frog first thing in the morning and nothing worse will happen to you the rest of the day.
Nothing is as easy as it looks.
Everything takes longer than you think. Whatever can go wrong, will go wrong. If there is a possibility of several things going wrong, the one that will cause the most damage will be the one to go wrong. If anything just cannot go wrong, it will anyway. If you perceive that there are four possible ways in which a procedure can go wrong and circumvent these, then a fifth way, unprepared for, will promptly develop.