If the slightest probability for an unpleasant event to happen exists, the event will take place, preferably during a demonstration.
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 there isn't a law, there will be.
If there is a 50-50 chance that something can go wrong, then 9 times out of 10 it will.
If things were left to chance, they would be better.
If two wrongs don't make a right, try three.
If you aim for the stars but only make it to the moon, remember there are people who have not yet made it to the moon.